CA2225805C - Electronic casino gaming system with improved play capacity, authentication and security - Google Patents
Electronic casino gaming system with improved play capacity, authentication and security Download PDFInfo
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- CA2225805C CA2225805C CA002225805A CA2225805A CA2225805C CA 2225805 C CA2225805 C CA 2225805C CA 002225805 A CA002225805 A CA 002225805A CA 2225805 A CA2225805 A CA 2225805A CA 2225805 C CA2225805 C CA 2225805C
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/50—Monitoring users, programs or devices to maintain the integrity of platforms, e.g. of processors, firmware or operating systems
- G06F21/51—Monitoring users, programs or devices to maintain the integrity of platforms, e.g. of processors, firmware or operating systems at application loading time, e.g. accepting, rejecting, starting or inhibiting executable software based on integrity or source reliability
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/50—Monitoring users, programs or devices to maintain the integrity of platforms, e.g. of processors, firmware or operating systems
- G06F21/57—Certifying or maintaining trusted computer platforms, e.g. secure boots or power-downs, version controls, system software checks, secure updates or assessing vulnerabilities
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/50—Monitoring users, programs or devices to maintain the integrity of platforms, e.g. of processors, firmware or operating systems
- G06F21/57—Certifying or maintaining trusted computer platforms, e.g. secure boots or power-downs, version controls, system software checks, secure updates or assessing vulnerabilities
- G06F21/575—Secure boot
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F21/60—Protecting data
- G06F21/64—Protecting data integrity, e.g. using checksums, certificates or signatures
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
- G06Q50/34—Betting or bookmaking, e.g. Internet betting
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07F—COIN-FREED OR LIKE APPARATUS
- G07F17/00—Coin-freed apparatus for hiring articles; Coin-freed facilities or services
- G07F17/32—Coin-freed apparatus for hiring articles; Coin-freed facilities or services for games, toys, sports, or amusements
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07F—COIN-FREED OR LIKE APPARATUS
- G07F17/00—Coin-freed apparatus for hiring articles; Coin-freed facilities or services
- G07F17/32—Coin-freed apparatus for hiring articles; Coin-freed facilities or services for games, toys, sports, or amusements
- G07F17/3286—Type of games
- G07F17/3288—Betting, e.g. on live events, bookmaking
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
- H04L9/0894—Escrow, recovery or storing of secret information, e.g. secret key escrow or cryptographic key storage
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/32—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
- H04L9/3236—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials using cryptographic hash functions
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/32—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
- H04L9/3236—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials using cryptographic hash functions
- H04L9/3239—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials using cryptographic hash functions involving non-keyed hash functions, e.g. modification detection codes [MDCs], MD5, SHA or RIPEMD
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/32—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
- H04L9/3247—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials involving digital signatures
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2211/00—Indexing scheme relating to details of data-processing equipment not covered by groups G06F3/00 - G06F13/00
- G06F2211/007—Encryption, En-/decode, En-/decipher, En-/decypher, Scramble, (De-)compress
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- G—PHYSICS
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2221/00—Indexing scheme relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F2221/21—Indexing scheme relating to G06F21/00 and subgroups addressing additional information or applications relating to security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
- G06F2221/2109—Game systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L2209/00—Additional information or applications relating to cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
- H04L2209/56—Financial cryptography, e.g. electronic payment or e-cash
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L2209/00—Additional information or applications relating to cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
- H04L2209/60—Digital content management, e.g. content distribution
Abstract
An electronic casino gaming system includes an unalterable ROM for storing a casino game authentication program, including a message digest algorithm program, a decryption program and a decryption key. A casino game data set containing casino game rules and image data is stored in a mass storage device, such as a local disk memory or a remote network file server, along with the signature of the casino game data set. The signature is an encrypted version of the message digest of the casino game data set, prepared using a hash function. Prior to permitting game play by a player, the casino game data set is transferred from the mass storage device to main memory and during this process the message digest is computed from the image data using a hash function stored in the ROM. The encrypted version of the message digest transferred from the mass storage device is decrypted using the decryption program and decryption key stored in the unalterable ROM. The two message digests are then compared for a match: if a match exists, game play is permitted; if a match does not exist, game play is prohibited. The authentication procedure is also used to check all casino game software, both programs and fixed data sets, stored in any memory devices distributed throughout the system, such as the system boot ROM, NVRAM and all sub-system memory devices. The authentication procedure is run whenever a particular program or fixed data set is scheduled for use by the system, and also at periodic intervals and on demand.
Description
1 - Specification 4 PLAY CAPACITY, AUTHENTICATION AND SECURITY
7 Field of the Invention 8 This invention relates to microprocessor based gaming Systems used in 9 gambling casinos.
11 Srief Description of the Prior Art 12 Microprocessor based gaming systems are known which are used in gambling 13 casinos to augment the traditional slot machine games (e.g. three reel single or multi-14 line games) and card games, such as poker and black jack. In a typical gaming system of this type, a microprocessor based system includes both hardware and 16 software components to provide the game playing capabilities. The hardware 17 components include a video display for displaying the game play, mechanical 18 switches for enabling player selection of additional cards or game play choices, coin 19 acceptors and detectors and the electronic components usually found in a microprocessor based system, such as random access memory (RAM), read only 21 memory (ROM), a processor and one or more busses. The software components 22 include the initialization software, credit and payout routines, the game image and 23 rules data set, and a random number generator algorithm. In order to be acceptable 24 for casino use, an electronic gaming system must provide both security and authentication for the software components. For this reason, gaming commissions 26 have heretofore required that all software components of an electronic gaming system 27 be stored in unalterable memory, which is typically an unalterable ROM. In addition, 28 a copy of the contents of the ROM or a message digest of the contents (or both) are 29 normally kept on f 1e in a secure location designated by the gaming commission so ' 30 that the contents of an individual ROM removed from a gaming machine can be 31 verified against the custodial version.
32 In a typical arrangement, a message digest of the ROM contents is initially 33 generated prior to the installation of the ROM in the machine by using a known 1 algorithm usually referred to as a hash function. A hash function is a computation 2 procedure that produces a fixed-size string of bits from a variable-size digital input.
3 The fixed-sized string of bits is termed the hash value. If the hash function is 4 difficult to invert -- termed a one-way hash function -- the hash function is also termed a message digest function, and the result is termed the message digest.
The 6 message digest is unique to any given variable size input data set, i.e., the game data 7 set stored in the ROM. When it becomes necessary to later authenticate the ROM
8 from any given machine, the ROM is physically removed from the game console and 9 the message digest of the ROM contents is computed directly from the ROM
using the original hash function. The computed message digest is compared with the 11 message digest on file at the designated custodial location (typically in the casino 12 itself). This procedure is typically carried out whenever a machine produces a payoff 13 beyond a given threshold value. If the two message digests match, then the contents 14 of the ROM are considered to be authenticated (verified) and the payout is made to the player.
16 While such electronic casino gaming systems have been found to be useful 17 in promoting casino game play, the restriction requiring that the casino game 18 program be stored in unalterable ROM memory, leads to a number of 19 disadvantageous limitations. First, due to the limited capacity of the ROM
storage media traditionally used to hold the program, the scope of game play available with 21 such systems is severely limited. For sophisticated games using motion video and 22 audio mufti-media elements, much more memory capacity, on the order of hundreds 23 of megabytes, is necessary. However, physical verification of such a large quantity 24 of physical devices is not practical, and has thus far been an impediment to creating sophisticated games with more player appeal. Second, the authentication check is 26 only conducted on a limited basis (usually after a jackpot) or other significant 27 winning game outcome, and the authentication procedure requires that game play be 28 halted until the ROM contents have been found to be authentic.
SUMMARY OF THE INVENTION
31 The invention comprises an electronic casino gaming system which greatly 32 expands casino game play capability and enhances security and authentication 33 capabilities. More particularly, the invention comprises an electronic casino gaming 1 system and method having greatly expanded mass storage capability for storing a 2 multiplicity of high resolution, high sound quality casino type games, and provides 3 enhanced authentication of the stored game program information with a high security 4 factor.
According to a first aspect of the invention, authentication of a casino game 6 data set is carried out within the casino game console using an authentication 7 program stored in an unalterable ROM physically located within the casino game 8 console. The casino game data set and a unique signature are stored in a mass 9 storage device, which may comprise a read only unit or a read/write unit and which may be physically located either within the casino game console or remotely located 11 and linked to the casino game console over a suitable network. The authentication 12 program stored in the unalterable ROM performs an authentication check on the 13 casino game data set at appropriate times, such as prior to commencement of game 14 play, at periodic intervals or upon demand. At appropriate occasions, the contents of the unalterable ROM can be verified by computing the message digest of the 16 unalterable ROM contents and comparing this computed message digest with a 17 securely stored copy of the message digest computed from the ROM contents prior 18 to installation in the casino game console.
19 From a process standpoint, this aspect of the invention comprises a method of authenticating a data set of a casino style game which consists of two phases: a 21 game data set preparation phase and a game data set checking phase. In the game 22 data set preparation phase, the method proceeds by providing a data set for a casino 23 game, computing a first abbreviated bit string unique to the casino game data set, 24 encrypting the first abbreviated bit string to provide an encrypted signature of the casino game data set, and storing the casino game data set and the signature in a 26 mass storage device. The first abbreviated bit string is preferably computed using a 27 hash function to produce a message digest of the casino game data set. The signature 28 is then encrypted from the message digest. After storage of the game data set and 29 unique signature, this information is installed in a casino game console.
The casino ' 30 game data set checking phase proceeds by computing a second abbreviated bit string 31 from the stored casino game data set using the same hash function, decrypting the 32 stored encrypted signature to recover the first abbreviated bit string, and comparing 33 the first and second abbreviated bit strings to determine whether the two strings 1 match. If a match does occur, the casino game data set is deemed authentic;
if there 2 is no match, authentication is denied and game play is prohibited.
3 The encryption/decryption process is preferably performed using a private , 4 key/public key technique in which the first abbreviated bit string is encrypted by the game manufacturer using a private encryption key maintained in the custody of the 6 game manufacturer. The decryption of the signature is performed using a public key 7 which is contained in an unalterable read only memory element located in the game 8 console, along with the casino game data set. The casino game data set is preferably 9 stored in a mass storage device, such as a magnetic or CD-ROM disk drive unit or a network file unit, the selected unit having a relatively large capacity. The actual 11 size of the mass storage device will depend upon the casino game storage 12 requirements and can be tailored to any specific application.
13 Each time a casino game data set is transferred from the mass storage device 14 to the main memory of the system, the authentication routine is run. The authentication routine can also be means of an operator switch mounted in the game 16 console or remotely via a network. Consequently, the authenticity of the data set can 17 be automatically checked whenever the transfer occurs and at other appropriate times.
18 In order to detect attempts to tamper with the contents of the unalterable read 19 only memory element located in the game console, a message digest computed for the authentication program stored therein is stored in a secure manner in a different 21 location from the game console, such as the casino operator's security facilities or 22 the facilities of a gaming commission (or both). The authenticity of the unalterable 23 read only memory element is checked in the same way as that now performed in 24 prior art devices: viz. computing the message digest directly from the unalterable read only memory device, and comparing the message digest thus computed with the 26 custodial version.
27 From an apparatus standpoint, the first aspect of the invention comprises an 28 electronic casino gaming system having means for providing authentication of a ' 29 game data set of a casino type game prior to permitting game play, the system including first means for storing a casino game data set and a signature of the casino 31 game data set, the signature comprising an encrypted version of a unique first 32 abbreviated bit string computed from the casino game data set; second means for 33 storing an authentication program capable of computing a second abbreviated bit 1 string from the casino game data set stored in the fast storing means and capable of 2 decrypting the encrypted signature stored in the first storing means to recover the 3 first abbreviated bit string; processing means for enabling the authentication program 4 to compute an abbreviated bit string from the casino game data set stored in the first storing means and for enabling the authentication program to decrypt the encrypted 6 signature; and means for comparing the computed second abbreviated bit string with 7 the decrypted abbreviated bit string to determine whether a match is present. The 8 first storing means preferably comprises a mass storage device, such as a disk drive 9 unit, a CD-ROM unit or a network storage unit. The second storing means preferably comprises an unalterable read only memory in which the authentication program is 11 stored.
12 According to a second aspect of the invention, the authentication program 13 stored in the unalterable ROM located within the casino game console is used to test 14 the authenticity of all other programs and fixed data stored in memory devices in the electronic casino gaming system, such as a system boot ROM, memory devices 16 containing the operating system program, system drivers and executive/loader 17 programs, and other memory devices incorporated into the electronic casino game 18 system architecture. The contents of each such memory device, whether program 19 information and fixed data, include signatures encrypted from message digests computed using a hash function from the original program informationandfixed data 21 set. Upon system initialization, the authentication program in the unalterable ROM
22 is used to authenticate the individual memory device contents in essentially the same 23 fashion as that used to authenticate the casino game data sets. More specifically, the 24 message digest for the given programandfixed data set is computed using the same hash function originally used to produce the message digest for that program and fixed 26 data set. The encrypted signature is decrypted using the proper decryption program 27 and decryption key to recover the message digest. The two versions of the message 28 digest are then compared and, if found to be matching, the concerned program and 2~ fixed data set is deemed authentic and is permitted to be used by the system. Once all of the concerned programs and fixed data sets have been so authenticated, the 31 casino game data set authentication procedure is run, after which game play is 32 permitted (provided a match occurs).
WO 97/01902 PCTlUS96/10463 1 From a process standpoint, this second aspect of the invention comprises a 2 method of authenticating a program or data set of a casino style game which consists 3 of two phases: a program ana fixed data set preparation phase, and a program and fixed 4 data set checking phase. In the program and fixed data set preparation phase, the method proceeds by providing a program and fixed data set for a casino game, 6 computing a first abbreviated bit string unique to the program and fixed data set, 7 encrypting the first abbreviated bit string to provide an encrypted signature of the 8 program aadfixed data set, and storing the program and fixed data set and the signature 9 in a memory device. The first abbreviated bit string is preferably computed using a hash function to produce a message digest of the programandfixed data set. The 11 signature is then encrypted from the message digest. After storage of the program and 12 fixed data set and unique signature in the memory device, the memory device is 13 installed in a casino game console. The casino game program and fixed data set 14 checking phase proceeds by computing a second abbreviated bit string from the stored casino game program and fixed data set stored in the memory device using the 16 same hash function, decrypting the encrypted signature stored in the memory device 17 to recover the first abbreviated bit string, and comparing the first and second 18 abbreviated bit strings to determine whether the two strings match. If a match does 19 occur, the casino game program and fixed data set is deemed authentic; if there is no match, authentication is denied and use of that casino game program and fixed data 21 set is prohibited.
22 The authentication routine is run each time a given casino game program and 23 fixed data set needs to be called or used. The authentication routine can also be run 24 automatically on a periodic basis, or on demand -- either locally by means of an operator switch mounted in the casino game console or remotely via a network.
26 Consequently, the authenticity of the casino game program and fixed data set pan be 27 automatically checked whenever use of that program andfixed data set is required and 28 at other appropriate times, such as in the course of a gaming commission audit.
29 From an apparatus standpoint, this second aspect of the invention comprises an electronic casino gaming system for providing authentication of a casino game 31 program and fixed data set prior to permitting system use of that casino game program 32 and fixed data set, the system including first means for storing a casino game program 33 and fixed data set and a signature of the casino game programandfixed data set; the WO 97/01902 -7- rLT/US96/10463 I signature comprising an encrypted version of a unique first abbreviated bit string 2 computed from the casino game program andfixed data set; second means for storing 3 an authentication program capable of computing a second abbreviated bit string from 4 the casino game program ar,d fixed data set stored in the first storing means and capable of decrypting the encrypted signature stored in the fast storing means to 6 recover the first abbreviated bit string; processing means for enabling the 7 authentication program to compute an abbreviated bit string from the casino game 8 program aad fixed data set stored in the first storing means and for enabling the 9 authentication program to decrypt the encrypted signature; and means for comparing the computed second abbreviated bit string with the decrypted abbreviated bit string 11 to determine whether a match is present. The first storing means preferably 12 comprises a memory device, such as a read only memory or random access memory.
13 The second storing means preferably comprises an unalterable read only memory in 14 which the authentication program is stored.
Electronic casino game systems incorporating the invention provide a vastly 16 expanded capacity for more sophisticated and attractive casino-style games, while at 17 the same time improving the authentication of the games without compromising 18 ~ security. In addition, casino game systems incorporating the invention provide great 19 flexibility in changing casino game play, since the casino game data sets representing the various games can be stored in alterable media rather than read only memory 21 units as with present casino game systems.
22 By separating the authentication process from the casino game data set 23 storage, the invention affords secure distribution and execution of program code and 24 data, regardless of the particular distribution or storage technique employed. More specifically, the invention allows the casino game data set to reside in any form of 26 secondary storage media, such as the traditional ROM storage, hard magnetic disk 27 drives and CD-ROM drives, or networked file systems. So Long as the authentication 28 procedure conducted on the game data set is performed using the authentication 29 program stored in an unalterable ROM, and so long as that ROM can be verified reliably, any casino game data set can be loaded from any source and can be verified 31 by the system at any time: either prior to use, during run-time, periodically during 32 run-time or upon demand. The large quantities of storage that can be made available 33 in a secure fashion using the invention, facilitates the creation of casino gamine _g_ 1 systems offering both an increased diversity of games, and individual games of 2 superior quality. In addition, the authentication of all casino game program and fixed 3 data software ensures the integrity of all system software both prior to game play and 4 thereafter at periodic or random intervals.
For a fuller understanding of the nature and advantages of the invention, 6 reference should be had to the ensuing detailed description taken in conjunction with 7 the accompanying drawings.
FIG. 1 is a block diagram of a system incorporating the invention;
11 FIG. 2 is a schematic diagram illustrating the contents of the read only 12 memory and the mass storage device;
13 FIG. 3 is a more detailed schematic view of the authentication program stored 14 in the ROM and the game data stored in the mass storage unit;
FIG. 4 is a diagram illustrating the preparation of the game data set;
16 FIG. S is a diagram illustrating the authentication procedure for the game data 17 set; and 18 FIG. 6 is a diagram illustrating an alternative approach to the secure loading 19 of software into the system.
22 Turning now to the drawings, FIG. 1 is a block diagram of an electronic 23 casino gaming system incorporating the invention. As seen in this figure, the system 24 consists of several system components under software control. These system components include a microprocessor 12, which may comprise any general purpose 26 microprocessor, such as a Pentium-based microprocessor from Intel Corporation. A
27 main memory unit 13 is provided, which is typically a random access memory 28 having a capacity of between 32 and 64 megabytes for storing the majority of -29 programs and graphics elements during game play. A system boot ROM 14 provides the initialization software required when power is first applied to the system. ROM
31 14 contains additional' programs in read only form, including the operating system, 32 related drivers and the authentication software described in detail below.
A non-33 volatile RAM 17 is a battery backed static RAM capable of maintaining its contents 1 through power cycling. NV RAM 17 stores significant information relating to game 2 play, such as the number of player credits, the last game outcome and certain 3 diagnostic and error information not critical to an understanding of the invention.
4 A mass storage unit implemented in the Fig. 1 system as a magnetic hard disk drive unit 18 is coupled to and controlled by a disk subsystem 19 of conventional 6 design and operation. Disk drive unit 18 provides storage for the game specific data 7 set, which includes both program data and image data specifying the rules of the 8 various different casino games or single casino game variations, and the types of 9 images and image sequences to be displayed to the game players. The size of the disk drive unit 18 is a function of the number of games and game variations 11 provided for a given system, as well as the amount of data required for each specific 12 game. In general, the more motion video designed into a particular casino game, the 13 more storage required for that casino game software. A disk drive unit 18 with a 4-14 gigabyte capacity will usually provide sufficient storage capacity. Disk subsystem 19 comprises a disk controller connected to a PCI bus 20 for controlling the disk drive 16 unit 18. Controller 19 preferably supports SCSI-2, with options of fast and wide. It 17 should be noted that a number of different types of locally-based disk drive units 18 may be used in the Fig. 1 system, including a CD-ROM storage unit. Also, the mass 19 storage unit need not be physically located within the game console along with the other elements depicted in Fig. 1: the mass storage unit may be located remotely 21 from the game console and coupled thereto by means of an appropriate network, 22 such as an ethernet, an 85232 link, or some other hard-wired or wireless network 23 link. This latter alternate arrangement is indicated by the inclusion of a network 24 subsystem 21 of appropriate configuration and functional characteristics, which may have ethernet, 85232 serial, or other network compatibility.
26 A video subsystem 22 is coupled to the PCI bus and provides the capability 27 of displaying full color still images and MPEG movies with a relatively high frame 28 rate (e.g. 30 frames per second) on an appropriate monitor (not shown).
Optional 3D
29 texture mapping may be added to this system, if desired.
' 30 A sound subsystem 23 having a stereo sound playback capability with up to 31 16 bit CD quality sound is coupled to an ISA bus 24. A general purpose 32 input/output unit 25 provides interfaces to the game mechanical devices (not 33 __illustrated) such as manually actuatable switches and display lights. A
first bridge 1 circuit 27 provides an interface between microprocessor 12, ROM 14, main memory 2 13 and PCI bus 20. Bridge circuit 27 is preferably a TRITON chip set available from 3 INTEL Corporation. A second bridge circuit 28 provides an interface between the 4 PCI bus 20 and the ISA bus 24. Bridge eircuit 28 is preferably a type 82378 chip available from Intel Corporation.
6 Fig. 2 illustrates the types of information stored in the system ROM 14 and 7 the mass storage unit. As seen in Fig. 2, the ROM unit 14 used in the Fig. 1 system 8 comprises two separate ROM elements: ROM 29 and ROM 30. ROM 29 must be an 9 unalterable device, such as a Toshiba type C53400 512Kx8 bit mask programmed ROM. ROM 30 is preferably an unalterable device like ROM 29, but may comprise 11 a different type of ROM, such as a type 29F040 field programmable flash ROM
7 Field of the Invention 8 This invention relates to microprocessor based gaming Systems used in 9 gambling casinos.
11 Srief Description of the Prior Art 12 Microprocessor based gaming systems are known which are used in gambling 13 casinos to augment the traditional slot machine games (e.g. three reel single or multi-14 line games) and card games, such as poker and black jack. In a typical gaming system of this type, a microprocessor based system includes both hardware and 16 software components to provide the game playing capabilities. The hardware 17 components include a video display for displaying the game play, mechanical 18 switches for enabling player selection of additional cards or game play choices, coin 19 acceptors and detectors and the electronic components usually found in a microprocessor based system, such as random access memory (RAM), read only 21 memory (ROM), a processor and one or more busses. The software components 22 include the initialization software, credit and payout routines, the game image and 23 rules data set, and a random number generator algorithm. In order to be acceptable 24 for casino use, an electronic gaming system must provide both security and authentication for the software components. For this reason, gaming commissions 26 have heretofore required that all software components of an electronic gaming system 27 be stored in unalterable memory, which is typically an unalterable ROM. In addition, 28 a copy of the contents of the ROM or a message digest of the contents (or both) are 29 normally kept on f 1e in a secure location designated by the gaming commission so ' 30 that the contents of an individual ROM removed from a gaming machine can be 31 verified against the custodial version.
32 In a typical arrangement, a message digest of the ROM contents is initially 33 generated prior to the installation of the ROM in the machine by using a known 1 algorithm usually referred to as a hash function. A hash function is a computation 2 procedure that produces a fixed-size string of bits from a variable-size digital input.
3 The fixed-sized string of bits is termed the hash value. If the hash function is 4 difficult to invert -- termed a one-way hash function -- the hash function is also termed a message digest function, and the result is termed the message digest.
The 6 message digest is unique to any given variable size input data set, i.e., the game data 7 set stored in the ROM. When it becomes necessary to later authenticate the ROM
8 from any given machine, the ROM is physically removed from the game console and 9 the message digest of the ROM contents is computed directly from the ROM
using the original hash function. The computed message digest is compared with the 11 message digest on file at the designated custodial location (typically in the casino 12 itself). This procedure is typically carried out whenever a machine produces a payoff 13 beyond a given threshold value. If the two message digests match, then the contents 14 of the ROM are considered to be authenticated (verified) and the payout is made to the player.
16 While such electronic casino gaming systems have been found to be useful 17 in promoting casino game play, the restriction requiring that the casino game 18 program be stored in unalterable ROM memory, leads to a number of 19 disadvantageous limitations. First, due to the limited capacity of the ROM
storage media traditionally used to hold the program, the scope of game play available with 21 such systems is severely limited. For sophisticated games using motion video and 22 audio mufti-media elements, much more memory capacity, on the order of hundreds 23 of megabytes, is necessary. However, physical verification of such a large quantity 24 of physical devices is not practical, and has thus far been an impediment to creating sophisticated games with more player appeal. Second, the authentication check is 26 only conducted on a limited basis (usually after a jackpot) or other significant 27 winning game outcome, and the authentication procedure requires that game play be 28 halted until the ROM contents have been found to be authentic.
SUMMARY OF THE INVENTION
31 The invention comprises an electronic casino gaming system which greatly 32 expands casino game play capability and enhances security and authentication 33 capabilities. More particularly, the invention comprises an electronic casino gaming 1 system and method having greatly expanded mass storage capability for storing a 2 multiplicity of high resolution, high sound quality casino type games, and provides 3 enhanced authentication of the stored game program information with a high security 4 factor.
According to a first aspect of the invention, authentication of a casino game 6 data set is carried out within the casino game console using an authentication 7 program stored in an unalterable ROM physically located within the casino game 8 console. The casino game data set and a unique signature are stored in a mass 9 storage device, which may comprise a read only unit or a read/write unit and which may be physically located either within the casino game console or remotely located 11 and linked to the casino game console over a suitable network. The authentication 12 program stored in the unalterable ROM performs an authentication check on the 13 casino game data set at appropriate times, such as prior to commencement of game 14 play, at periodic intervals or upon demand. At appropriate occasions, the contents of the unalterable ROM can be verified by computing the message digest of the 16 unalterable ROM contents and comparing this computed message digest with a 17 securely stored copy of the message digest computed from the ROM contents prior 18 to installation in the casino game console.
19 From a process standpoint, this aspect of the invention comprises a method of authenticating a data set of a casino style game which consists of two phases: a 21 game data set preparation phase and a game data set checking phase. In the game 22 data set preparation phase, the method proceeds by providing a data set for a casino 23 game, computing a first abbreviated bit string unique to the casino game data set, 24 encrypting the first abbreviated bit string to provide an encrypted signature of the casino game data set, and storing the casino game data set and the signature in a 26 mass storage device. The first abbreviated bit string is preferably computed using a 27 hash function to produce a message digest of the casino game data set. The signature 28 is then encrypted from the message digest. After storage of the game data set and 29 unique signature, this information is installed in a casino game console.
The casino ' 30 game data set checking phase proceeds by computing a second abbreviated bit string 31 from the stored casino game data set using the same hash function, decrypting the 32 stored encrypted signature to recover the first abbreviated bit string, and comparing 33 the first and second abbreviated bit strings to determine whether the two strings 1 match. If a match does occur, the casino game data set is deemed authentic;
if there 2 is no match, authentication is denied and game play is prohibited.
3 The encryption/decryption process is preferably performed using a private , 4 key/public key technique in which the first abbreviated bit string is encrypted by the game manufacturer using a private encryption key maintained in the custody of the 6 game manufacturer. The decryption of the signature is performed using a public key 7 which is contained in an unalterable read only memory element located in the game 8 console, along with the casino game data set. The casino game data set is preferably 9 stored in a mass storage device, such as a magnetic or CD-ROM disk drive unit or a network file unit, the selected unit having a relatively large capacity. The actual 11 size of the mass storage device will depend upon the casino game storage 12 requirements and can be tailored to any specific application.
13 Each time a casino game data set is transferred from the mass storage device 14 to the main memory of the system, the authentication routine is run. The authentication routine can also be means of an operator switch mounted in the game 16 console or remotely via a network. Consequently, the authenticity of the data set can 17 be automatically checked whenever the transfer occurs and at other appropriate times.
18 In order to detect attempts to tamper with the contents of the unalterable read 19 only memory element located in the game console, a message digest computed for the authentication program stored therein is stored in a secure manner in a different 21 location from the game console, such as the casino operator's security facilities or 22 the facilities of a gaming commission (or both). The authenticity of the unalterable 23 read only memory element is checked in the same way as that now performed in 24 prior art devices: viz. computing the message digest directly from the unalterable read only memory device, and comparing the message digest thus computed with the 26 custodial version.
27 From an apparatus standpoint, the first aspect of the invention comprises an 28 electronic casino gaming system having means for providing authentication of a ' 29 game data set of a casino type game prior to permitting game play, the system including first means for storing a casino game data set and a signature of the casino 31 game data set, the signature comprising an encrypted version of a unique first 32 abbreviated bit string computed from the casino game data set; second means for 33 storing an authentication program capable of computing a second abbreviated bit 1 string from the casino game data set stored in the fast storing means and capable of 2 decrypting the encrypted signature stored in the first storing means to recover the 3 first abbreviated bit string; processing means for enabling the authentication program 4 to compute an abbreviated bit string from the casino game data set stored in the first storing means and for enabling the authentication program to decrypt the encrypted 6 signature; and means for comparing the computed second abbreviated bit string with 7 the decrypted abbreviated bit string to determine whether a match is present. The 8 first storing means preferably comprises a mass storage device, such as a disk drive 9 unit, a CD-ROM unit or a network storage unit. The second storing means preferably comprises an unalterable read only memory in which the authentication program is 11 stored.
12 According to a second aspect of the invention, the authentication program 13 stored in the unalterable ROM located within the casino game console is used to test 14 the authenticity of all other programs and fixed data stored in memory devices in the electronic casino gaming system, such as a system boot ROM, memory devices 16 containing the operating system program, system drivers and executive/loader 17 programs, and other memory devices incorporated into the electronic casino game 18 system architecture. The contents of each such memory device, whether program 19 information and fixed data, include signatures encrypted from message digests computed using a hash function from the original program informationandfixed data 21 set. Upon system initialization, the authentication program in the unalterable ROM
22 is used to authenticate the individual memory device contents in essentially the same 23 fashion as that used to authenticate the casino game data sets. More specifically, the 24 message digest for the given programandfixed data set is computed using the same hash function originally used to produce the message digest for that program and fixed 26 data set. The encrypted signature is decrypted using the proper decryption program 27 and decryption key to recover the message digest. The two versions of the message 28 digest are then compared and, if found to be matching, the concerned program and 2~ fixed data set is deemed authentic and is permitted to be used by the system. Once all of the concerned programs and fixed data sets have been so authenticated, the 31 casino game data set authentication procedure is run, after which game play is 32 permitted (provided a match occurs).
WO 97/01902 PCTlUS96/10463 1 From a process standpoint, this second aspect of the invention comprises a 2 method of authenticating a program or data set of a casino style game which consists 3 of two phases: a program ana fixed data set preparation phase, and a program and fixed 4 data set checking phase. In the program and fixed data set preparation phase, the method proceeds by providing a program and fixed data set for a casino game, 6 computing a first abbreviated bit string unique to the program and fixed data set, 7 encrypting the first abbreviated bit string to provide an encrypted signature of the 8 program aadfixed data set, and storing the program and fixed data set and the signature 9 in a memory device. The first abbreviated bit string is preferably computed using a hash function to produce a message digest of the programandfixed data set. The 11 signature is then encrypted from the message digest. After storage of the program and 12 fixed data set and unique signature in the memory device, the memory device is 13 installed in a casino game console. The casino game program and fixed data set 14 checking phase proceeds by computing a second abbreviated bit string from the stored casino game program and fixed data set stored in the memory device using the 16 same hash function, decrypting the encrypted signature stored in the memory device 17 to recover the first abbreviated bit string, and comparing the first and second 18 abbreviated bit strings to determine whether the two strings match. If a match does 19 occur, the casino game program and fixed data set is deemed authentic; if there is no match, authentication is denied and use of that casino game program and fixed data 21 set is prohibited.
22 The authentication routine is run each time a given casino game program and 23 fixed data set needs to be called or used. The authentication routine can also be run 24 automatically on a periodic basis, or on demand -- either locally by means of an operator switch mounted in the casino game console or remotely via a network.
26 Consequently, the authenticity of the casino game program and fixed data set pan be 27 automatically checked whenever use of that program andfixed data set is required and 28 at other appropriate times, such as in the course of a gaming commission audit.
29 From an apparatus standpoint, this second aspect of the invention comprises an electronic casino gaming system for providing authentication of a casino game 31 program and fixed data set prior to permitting system use of that casino game program 32 and fixed data set, the system including first means for storing a casino game program 33 and fixed data set and a signature of the casino game programandfixed data set; the WO 97/01902 -7- rLT/US96/10463 I signature comprising an encrypted version of a unique first abbreviated bit string 2 computed from the casino game program andfixed data set; second means for storing 3 an authentication program capable of computing a second abbreviated bit string from 4 the casino game program ar,d fixed data set stored in the first storing means and capable of decrypting the encrypted signature stored in the fast storing means to 6 recover the first abbreviated bit string; processing means for enabling the 7 authentication program to compute an abbreviated bit string from the casino game 8 program aad fixed data set stored in the first storing means and for enabling the 9 authentication program to decrypt the encrypted signature; and means for comparing the computed second abbreviated bit string with the decrypted abbreviated bit string 11 to determine whether a match is present. The first storing means preferably 12 comprises a memory device, such as a read only memory or random access memory.
13 The second storing means preferably comprises an unalterable read only memory in 14 which the authentication program is stored.
Electronic casino game systems incorporating the invention provide a vastly 16 expanded capacity for more sophisticated and attractive casino-style games, while at 17 the same time improving the authentication of the games without compromising 18 ~ security. In addition, casino game systems incorporating the invention provide great 19 flexibility in changing casino game play, since the casino game data sets representing the various games can be stored in alterable media rather than read only memory 21 units as with present casino game systems.
22 By separating the authentication process from the casino game data set 23 storage, the invention affords secure distribution and execution of program code and 24 data, regardless of the particular distribution or storage technique employed. More specifically, the invention allows the casino game data set to reside in any form of 26 secondary storage media, such as the traditional ROM storage, hard magnetic disk 27 drives and CD-ROM drives, or networked file systems. So Long as the authentication 28 procedure conducted on the game data set is performed using the authentication 29 program stored in an unalterable ROM, and so long as that ROM can be verified reliably, any casino game data set can be loaded from any source and can be verified 31 by the system at any time: either prior to use, during run-time, periodically during 32 run-time or upon demand. The large quantities of storage that can be made available 33 in a secure fashion using the invention, facilitates the creation of casino gamine _g_ 1 systems offering both an increased diversity of games, and individual games of 2 superior quality. In addition, the authentication of all casino game program and fixed 3 data software ensures the integrity of all system software both prior to game play and 4 thereafter at periodic or random intervals.
For a fuller understanding of the nature and advantages of the invention, 6 reference should be had to the ensuing detailed description taken in conjunction with 7 the accompanying drawings.
FIG. 1 is a block diagram of a system incorporating the invention;
11 FIG. 2 is a schematic diagram illustrating the contents of the read only 12 memory and the mass storage device;
13 FIG. 3 is a more detailed schematic view of the authentication program stored 14 in the ROM and the game data stored in the mass storage unit;
FIG. 4 is a diagram illustrating the preparation of the game data set;
16 FIG. S is a diagram illustrating the authentication procedure for the game data 17 set; and 18 FIG. 6 is a diagram illustrating an alternative approach to the secure loading 19 of software into the system.
22 Turning now to the drawings, FIG. 1 is a block diagram of an electronic 23 casino gaming system incorporating the invention. As seen in this figure, the system 24 consists of several system components under software control. These system components include a microprocessor 12, which may comprise any general purpose 26 microprocessor, such as a Pentium-based microprocessor from Intel Corporation. A
27 main memory unit 13 is provided, which is typically a random access memory 28 having a capacity of between 32 and 64 megabytes for storing the majority of -29 programs and graphics elements during game play. A system boot ROM 14 provides the initialization software required when power is first applied to the system. ROM
31 14 contains additional' programs in read only form, including the operating system, 32 related drivers and the authentication software described in detail below.
A non-33 volatile RAM 17 is a battery backed static RAM capable of maintaining its contents 1 through power cycling. NV RAM 17 stores significant information relating to game 2 play, such as the number of player credits, the last game outcome and certain 3 diagnostic and error information not critical to an understanding of the invention.
4 A mass storage unit implemented in the Fig. 1 system as a magnetic hard disk drive unit 18 is coupled to and controlled by a disk subsystem 19 of conventional 6 design and operation. Disk drive unit 18 provides storage for the game specific data 7 set, which includes both program data and image data specifying the rules of the 8 various different casino games or single casino game variations, and the types of 9 images and image sequences to be displayed to the game players. The size of the disk drive unit 18 is a function of the number of games and game variations 11 provided for a given system, as well as the amount of data required for each specific 12 game. In general, the more motion video designed into a particular casino game, the 13 more storage required for that casino game software. A disk drive unit 18 with a 4-14 gigabyte capacity will usually provide sufficient storage capacity. Disk subsystem 19 comprises a disk controller connected to a PCI bus 20 for controlling the disk drive 16 unit 18. Controller 19 preferably supports SCSI-2, with options of fast and wide. It 17 should be noted that a number of different types of locally-based disk drive units 18 may be used in the Fig. 1 system, including a CD-ROM storage unit. Also, the mass 19 storage unit need not be physically located within the game console along with the other elements depicted in Fig. 1: the mass storage unit may be located remotely 21 from the game console and coupled thereto by means of an appropriate network, 22 such as an ethernet, an 85232 link, or some other hard-wired or wireless network 23 link. This latter alternate arrangement is indicated by the inclusion of a network 24 subsystem 21 of appropriate configuration and functional characteristics, which may have ethernet, 85232 serial, or other network compatibility.
26 A video subsystem 22 is coupled to the PCI bus and provides the capability 27 of displaying full color still images and MPEG movies with a relatively high frame 28 rate (e.g. 30 frames per second) on an appropriate monitor (not shown).
Optional 3D
29 texture mapping may be added to this system, if desired.
' 30 A sound subsystem 23 having a stereo sound playback capability with up to 31 16 bit CD quality sound is coupled to an ISA bus 24. A general purpose 32 input/output unit 25 provides interfaces to the game mechanical devices (not 33 __illustrated) such as manually actuatable switches and display lights. A
first bridge 1 circuit 27 provides an interface between microprocessor 12, ROM 14, main memory 2 13 and PCI bus 20. Bridge circuit 27 is preferably a TRITON chip set available from 3 INTEL Corporation. A second bridge circuit 28 provides an interface between the 4 PCI bus 20 and the ISA bus 24. Bridge eircuit 28 is preferably a type 82378 chip available from Intel Corporation.
6 Fig. 2 illustrates the types of information stored in the system ROM 14 and 7 the mass storage unit. As seen in Fig. 2, the ROM unit 14 used in the Fig. 1 system 8 comprises two separate ROM elements: ROM 29 and ROM 30. ROM 29 must be an 9 unalterable device, such as a Toshiba type C53400 512Kx8 bit mask programmed ROM. ROM 30 is preferably an unalterable device like ROM 29, but may comprise 11 a different type of ROM, such as a type 29F040 field programmable flash ROM
12 available from Intel Corp. ROM 29 contains the system initialization or boot code, 13 an authentication program, a random number generator program and an initial portion 14 of the executive/loader programs. ROM 30 contains the operating system program, the system drivers and the remainder of the executive/loader programs as noted 16 below. The mass storage unit contains the applications, which include the game 17 image and sound data, rules of game play and the like, and the signature associated 18 to each particular casino game.
19 Fig. 3 illustrates the authentication and application program information in more detail. As seen in this figure, the authentication program stored in unalterable 21 ROM 29 comprises a message digest algorithm component 32, a decryption 22 algorithm component 33, and a decryption key component 34. The message digest 23 algorithm component 32 stored in ROM 29 comprises an exact copy of a hash 24 function program routine used to originally compute a message digest from the loadable game data set 36 in the manner described below. The decryption algorithm 26 component 33 stored in ROM 29 comprises the algorithm required to decrypt any 27 encrypted casino game data set signature using the decryption key component 34.
28 The decryption key component 34 comprises the decryption key that is ' 29 required to decrypt any of the encrypted signatures 37 in the manner described below during the authentication routine.
31 Fig. 4 illustrates the manner in which an encrypted data set signature 37 is 32 generated. A loadable casino game data set 36 is processed using a hash function 41 33 to generate a message digest 42 which is unique to the loadable game data set 36.
WO 97/01902 PCTlUS96/I0463 1 The hash function employed may be one of a number of known hash functions, such 2 as the MD2, MD4, and MDS hash functions and the SHS hash function; or any other 3 suitable hash function capable of producing a unique abbreviated bit string from a 4 variable size input data set. For further information about these hash functions, reference should be had to the publication entitled "Answers To Frequently Asked 6 Questions About Taday's Cryptography", Revision 2.0, October 5, 1993, published 7 by RSA Laboratories, Redwood City, California, and the publications listed in the 8 references section thereof. ARer generation, the message digest 42 is then encrypted with an 9 encryption algorithm 43 using a private encryption key 44 to generate a signature 37 of the message digest. In the preferred embodiment, the two-key (privatelpublic key) 11 encryption technique developed by RSA Data Security, Inc., of Redwood City.
12 California, is used. This technique is disclosed and described ~in U.S.
Patent Nos.
13 4,200,770, 4,218,582 and 4,405,829. The signature 37 of the message digest 42 is then 14 stored in the mass storage unit along with the loadable data set 36.
Fig. 5 illustrates the authentication routine carried out in accordance with the 16 invention. when the authentication routine is called (see below), the loadable casino 17 game data set 36 is transferred from the mass storage unit to main memory 18 ~ (unless already there), and the message digest of casino game data set 36 is 19 computed using the message digest algorithm 32. Message digest algorithm 32 uses the same hash function 41 as that used by the manufacturer to prepare the original 21 message digest 42. The result is an unencrypted version 46 of the message digest 22 computed from the casino game data set 36 currently present in the mass storage 23 unit. The encrypted data set signature 37 is decrypted using the public decryption key 24 34 matching the private key 44 used to originally encrypt the message digest 42 of the casino game data set 36. The message digest 47 decrypted with decryption key 26 34 is then compared with the message digest 46 computed from the casino game data 27 set 36. If the two message digests match, then the casino game data set 36 is deemed 28 authentic and game play may proceed. If there is no match, either the casino game 29 data set 36 or the signature 37 is deemed comtpted and not authentic. Game play is prohibited and appropriate actions can be taken: e.g. alerting a security employee 1 using a suitable messaging system (an audible alarm, flashing lights, or a network 2 message from the game console to a central security area).
3 In order to ensure that the authentication routine cannot be bypassed by , 4 tampering with the loader program stored in ROM 30, an initial part of the loader program is incorporated into unalterable ROM 29. This initial portion of the loader 6 program requires that the authentication program be called prior to the initiation of 7 any casino game play. Since this initial portion of the loader program is located in 8 the unalterable ROM 29, and since no casino game play can occur until the particular 9 casino game application data set 36 is loaded into main memory 13, the authentication procedure cannot be bypassed by tampering with the software stored 11 in ROM 30.
12 Since authentication of the game data set 36 and signature 37 is entrusted to 13 the contents of ROM 29, a procedure must be provided to verify the ROM 29 14 contents. For this purpose, a message digest is computed for the authentication I S program stored in ROM 29, and this message digest is stored in a secure manner 16 with the casino operator or the gaming commission (or both) along with the hash 17 function used to produce the message digest. This hash function may be the same 18 hash function used to compute the message digest 42 of the casino game data set or 19 a different hash function. In this way, the authenticity of the ROM 29 can be easily checked in the same way as that now performed in prior art devices: viz.
computing 21 the message digest directly from the ROM 29 and comparing the message digest thus 22 computed with the custodial version of the message digest. If required by a given 23 gaming commission or deemed desirable by a casino operator, the system may also 24 display the message digest 42 of each particular data set 36 or the encrypted signature version 37 for auditing purposes. In addition, the system may transmit this 26 information via networking subsystem 21 to an on-site or off site remote location 27 (such as the office of the gaming commission). The message digest displayed or 28 transmitted may comprise the decrypted version or the computed version (or both).
29 The authentication procedure carried out by means of the message digest program 32, decryption program 33 and decryption key 34 stored in unalterable 31 ROM 29 in the manner described above is also used to authenticate the contents of 32 all memory devices in the Fig. 1 system, such as the contents of ROM 30 (see Fig.
33 2), the fixed data portions and program components stored in NV RAM 17 and the 1 program and fixed data contents of any memory devices stored in the networking 2 subsystem 21, video subsystem 22, sound subsystem 23, PCI-ISA interface 24, and 3 GPIO unit 25. Each program or fixed data set stored in any memory device in any 4 of these units has an associated signature, which is encrypted from a message digest S of the original program or fixed data set using a hash function, which is preferably 6 the same hash function used to prepare the message digest of the casino game data 7 set. Prior to permitting any such program or fixed data set to participate in the 8 system operation, that program or fixed data set is subjected to the authorization 9 procedure to ensure that the message digest computed from the current version of the program or fixed data set matches the message digest decrypted from the encrypted 11 signature associated to the program or fixed data set. In addition, the authentication 12 procedure can be run on each such program or fixed data set at periodic or random 13 intervals (on demand) in a manner essentially identical to that described above with 14 respect to the casino game data set authentication procedure. As a consequence, the integrity of all software in the system is checked prior to the use of that particular 16 software in order to reveal any unauthorized changes to the software portion of the 17 casino gaming system.
18 An alternative approach to the secure loading of software into the system is 19 depicted in FIG. 6. In this embodiment the basic input/output system (BIOS) software is stored in a ROM 50, the first of two ROMs making up the system boot 21 ROM 14 (FIG. 1). The boot strap code, operating system code (OS), OS
drivers and 22 a secure loader are stored in a second ROM 52. An anchor application 54 including 23 graphics and sound drivers, system drivers, money-handling software, a second 24 secure loader, and a signature is stored in the mass storage 18 (FIG. 1 ).
When power is initially applied to the system on start-up, or when the system 26 experiences a warm restart, the CPU 12 will begin executing code from the BIOS
27 ROM 50. The BIOS is responsible for initializing the motherboard and peripheral 28 cards of the system. After the BIOS has completed the initialization, it jumps to the 29 boot strap code in ROM 252 causing the boot strap to copy the OS, OS
drivers, and ' 30 the secure loader into RAM.
31 Once in RAM, the OS is started and the secure loader stored in ROM 52 is 32 used to load the anchor application 54 from disk 18. O-n disk, the anchor application 1 has a signature that is used during the load to verify the validity of the anchor 2 application.
3 After the anchor application 54 is started, it will be used to load all other 4 applications. The secure loader of the anchor application will check the validity of an application to be loaded by computing the signature and comparing it against the .
6 one stored on disk with the application as described above.
7 An important advantage of the invention not found in 20 prior art systems 8 is the manner in which the casino game data set can be authenticated. In prior art 9 systems, authentication of the casino game data set is normally only done when a payout lying above a given threshold is required by the outcome of the game play, 11 and this requires that the game be disabled while the ROM is physically removed and 12 the ROM contents are verified. In systems incorporating the invention, the 13 authenticity of a given casino game data set can be checked in a variety of ways. For 14 example, the game data set 36 can be automatically subjected to the authentication procedure illustrated in Fig. 5 each time the game is loaded from the mass storage 16 unit into the main memory 13. Thus, as a player selects a casino game for game play 17 in the system, the authenticity of that game actually stored in the mass storage unit 18 is automatically checked using the authentication procedure described above without 19 removing the ROM 29. Further, if desired, the authentication procedure may be initiated in response to the pull of a slot game handle, the detection of a coin insert, 21 the payout of coins or issuing of credit, or any other detectable event related to game 22 play. The authenticity of a given casino game data set 36 can also be checked on 23 demand, either locally at the game console or remotely via a network, by providing 24 a demand procedure. Such a procedure may be initiated, e.g. by providing a manually operable switch in the game console, accessible only to authorized persons.
26 for initiating the authentication routine. Alternatively, the Fig. 1 system may be 27 configured to respond to a demand command generated remotely (e.g. in a security 28 area in the casino or off site) and transmitted to the game console over a network to 29 the networking subsystem 21.
Another advantage of the invention lies in the fact that the game data set 31 storage capacity of a system incorporating the invention is not limited by the size of 32 a ROM, but is rather dictated by the size of the mass storage unit. As a consequence_ 33 games using high resolution, high motion video and high quality stereo sound can WO 97/01902 _15_ PCT/US96/10463 1 be designed and played on systems incorporating the invention. Also, since the mass 2 storage unit need not be a read-only device, and need not be physically located in the 3 game console, the invention affords great flexibility in game content, scheduling and 4 changes. For example, to change the graphic images in a particular casino game or set of games, new casino game data sets can be generated along with new signatures 6 and stored in the mass storage unit by either exchanging disk drives, replacing disks 7 (for read only disk units), or writing new data to the media. In the networked mass 8 storage application, these changes can be made to the files controlled by the network 9 file server. Since the casino game data sets must pass the authentication procedure test, either periodically or on demand, corrupted data sets cannot go undetected. Thus 11 the invention opens up the field of electronic casino gaming systems to readily 12 modifiable games with flexible displays and rules, without sacrificing the essential 13 security of such systems. In fact, security is greatly enhanced by the ability of the 14 invention to authenticate all game data sets both regularly (for each handle pull) and at any time (on demand), without interfering with regular game play (unless no " ~,, i o iriazcn occurs netween the two forms of message digest).
17 While the above provides a full and complete disclosure of the preferred 18 embodiments of the invention, various modifications, alternate constructions and 19 equivalents may be employed without departing from the true spirit and scope of the invention. For example, while the RSA public/private key encryption technique is 21 preferred (due to the known advantages of this technique), a single, private key 22 encryption technique may be employed, if desired. In a system using this technique, 23 the single key would be stored in ROM 29 in place of the public key 34.
Also, the 24 message digest 42 and signature 37 for a given application 36 need not be computed from the entire casino game data set. For example, for some casino games it may be 26 desirable to provide a fixed set of rules while permitting future changes in the casino 27 game graphics, sound or both. For such casino games, it may be sufficient to 28 compute the message digest 42 and signature 37 from only the rules portion of the 29 applications program 36. In other cases, it may be desirable or convenient to ' 30 maintain the casino game video and audio portions constant. while allowing future 31 changes to the rules of game play. For casino games of this category, the message 32 digest 42 and signature 37 may be computed from the graphics and sound portions 33 of the application program 36. It may also be desirable to compute a message digest 1 42 and signature 37 from a subset of the rules, graphics or sound portions of a given 2 applications program 36, or from some other subset taken from a given applications 3 program 36. Therefore, the above should not be construed as limiting the scope of 4 the invention, which is defined by the appended claims.
19 Fig. 3 illustrates the authentication and application program information in more detail. As seen in this figure, the authentication program stored in unalterable 21 ROM 29 comprises a message digest algorithm component 32, a decryption 22 algorithm component 33, and a decryption key component 34. The message digest 23 algorithm component 32 stored in ROM 29 comprises an exact copy of a hash 24 function program routine used to originally compute a message digest from the loadable game data set 36 in the manner described below. The decryption algorithm 26 component 33 stored in ROM 29 comprises the algorithm required to decrypt any 27 encrypted casino game data set signature using the decryption key component 34.
28 The decryption key component 34 comprises the decryption key that is ' 29 required to decrypt any of the encrypted signatures 37 in the manner described below during the authentication routine.
31 Fig. 4 illustrates the manner in which an encrypted data set signature 37 is 32 generated. A loadable casino game data set 36 is processed using a hash function 41 33 to generate a message digest 42 which is unique to the loadable game data set 36.
WO 97/01902 PCTlUS96/I0463 1 The hash function employed may be one of a number of known hash functions, such 2 as the MD2, MD4, and MDS hash functions and the SHS hash function; or any other 3 suitable hash function capable of producing a unique abbreviated bit string from a 4 variable size input data set. For further information about these hash functions, reference should be had to the publication entitled "Answers To Frequently Asked 6 Questions About Taday's Cryptography", Revision 2.0, October 5, 1993, published 7 by RSA Laboratories, Redwood City, California, and the publications listed in the 8 references section thereof. ARer generation, the message digest 42 is then encrypted with an 9 encryption algorithm 43 using a private encryption key 44 to generate a signature 37 of the message digest. In the preferred embodiment, the two-key (privatelpublic key) 11 encryption technique developed by RSA Data Security, Inc., of Redwood City.
12 California, is used. This technique is disclosed and described ~in U.S.
Patent Nos.
13 4,200,770, 4,218,582 and 4,405,829. The signature 37 of the message digest 42 is then 14 stored in the mass storage unit along with the loadable data set 36.
Fig. 5 illustrates the authentication routine carried out in accordance with the 16 invention. when the authentication routine is called (see below), the loadable casino 17 game data set 36 is transferred from the mass storage unit to main memory 18 ~ (unless already there), and the message digest of casino game data set 36 is 19 computed using the message digest algorithm 32. Message digest algorithm 32 uses the same hash function 41 as that used by the manufacturer to prepare the original 21 message digest 42. The result is an unencrypted version 46 of the message digest 22 computed from the casino game data set 36 currently present in the mass storage 23 unit. The encrypted data set signature 37 is decrypted using the public decryption key 24 34 matching the private key 44 used to originally encrypt the message digest 42 of the casino game data set 36. The message digest 47 decrypted with decryption key 26 34 is then compared with the message digest 46 computed from the casino game data 27 set 36. If the two message digests match, then the casino game data set 36 is deemed 28 authentic and game play may proceed. If there is no match, either the casino game 29 data set 36 or the signature 37 is deemed comtpted and not authentic. Game play is prohibited and appropriate actions can be taken: e.g. alerting a security employee 1 using a suitable messaging system (an audible alarm, flashing lights, or a network 2 message from the game console to a central security area).
3 In order to ensure that the authentication routine cannot be bypassed by , 4 tampering with the loader program stored in ROM 30, an initial part of the loader program is incorporated into unalterable ROM 29. This initial portion of the loader 6 program requires that the authentication program be called prior to the initiation of 7 any casino game play. Since this initial portion of the loader program is located in 8 the unalterable ROM 29, and since no casino game play can occur until the particular 9 casino game application data set 36 is loaded into main memory 13, the authentication procedure cannot be bypassed by tampering with the software stored 11 in ROM 30.
12 Since authentication of the game data set 36 and signature 37 is entrusted to 13 the contents of ROM 29, a procedure must be provided to verify the ROM 29 14 contents. For this purpose, a message digest is computed for the authentication I S program stored in ROM 29, and this message digest is stored in a secure manner 16 with the casino operator or the gaming commission (or both) along with the hash 17 function used to produce the message digest. This hash function may be the same 18 hash function used to compute the message digest 42 of the casino game data set or 19 a different hash function. In this way, the authenticity of the ROM 29 can be easily checked in the same way as that now performed in prior art devices: viz.
computing 21 the message digest directly from the ROM 29 and comparing the message digest thus 22 computed with the custodial version of the message digest. If required by a given 23 gaming commission or deemed desirable by a casino operator, the system may also 24 display the message digest 42 of each particular data set 36 or the encrypted signature version 37 for auditing purposes. In addition, the system may transmit this 26 information via networking subsystem 21 to an on-site or off site remote location 27 (such as the office of the gaming commission). The message digest displayed or 28 transmitted may comprise the decrypted version or the computed version (or both).
29 The authentication procedure carried out by means of the message digest program 32, decryption program 33 and decryption key 34 stored in unalterable 31 ROM 29 in the manner described above is also used to authenticate the contents of 32 all memory devices in the Fig. 1 system, such as the contents of ROM 30 (see Fig.
33 2), the fixed data portions and program components stored in NV RAM 17 and the 1 program and fixed data contents of any memory devices stored in the networking 2 subsystem 21, video subsystem 22, sound subsystem 23, PCI-ISA interface 24, and 3 GPIO unit 25. Each program or fixed data set stored in any memory device in any 4 of these units has an associated signature, which is encrypted from a message digest S of the original program or fixed data set using a hash function, which is preferably 6 the same hash function used to prepare the message digest of the casino game data 7 set. Prior to permitting any such program or fixed data set to participate in the 8 system operation, that program or fixed data set is subjected to the authorization 9 procedure to ensure that the message digest computed from the current version of the program or fixed data set matches the message digest decrypted from the encrypted 11 signature associated to the program or fixed data set. In addition, the authentication 12 procedure can be run on each such program or fixed data set at periodic or random 13 intervals (on demand) in a manner essentially identical to that described above with 14 respect to the casino game data set authentication procedure. As a consequence, the integrity of all software in the system is checked prior to the use of that particular 16 software in order to reveal any unauthorized changes to the software portion of the 17 casino gaming system.
18 An alternative approach to the secure loading of software into the system is 19 depicted in FIG. 6. In this embodiment the basic input/output system (BIOS) software is stored in a ROM 50, the first of two ROMs making up the system boot 21 ROM 14 (FIG. 1). The boot strap code, operating system code (OS), OS
drivers and 22 a secure loader are stored in a second ROM 52. An anchor application 54 including 23 graphics and sound drivers, system drivers, money-handling software, a second 24 secure loader, and a signature is stored in the mass storage 18 (FIG. 1 ).
When power is initially applied to the system on start-up, or when the system 26 experiences a warm restart, the CPU 12 will begin executing code from the BIOS
27 ROM 50. The BIOS is responsible for initializing the motherboard and peripheral 28 cards of the system. After the BIOS has completed the initialization, it jumps to the 29 boot strap code in ROM 252 causing the boot strap to copy the OS, OS
drivers, and ' 30 the secure loader into RAM.
31 Once in RAM, the OS is started and the secure loader stored in ROM 52 is 32 used to load the anchor application 54 from disk 18. O-n disk, the anchor application 1 has a signature that is used during the load to verify the validity of the anchor 2 application.
3 After the anchor application 54 is started, it will be used to load all other 4 applications. The secure loader of the anchor application will check the validity of an application to be loaded by computing the signature and comparing it against the .
6 one stored on disk with the application as described above.
7 An important advantage of the invention not found in 20 prior art systems 8 is the manner in which the casino game data set can be authenticated. In prior art 9 systems, authentication of the casino game data set is normally only done when a payout lying above a given threshold is required by the outcome of the game play, 11 and this requires that the game be disabled while the ROM is physically removed and 12 the ROM contents are verified. In systems incorporating the invention, the 13 authenticity of a given casino game data set can be checked in a variety of ways. For 14 example, the game data set 36 can be automatically subjected to the authentication procedure illustrated in Fig. 5 each time the game is loaded from the mass storage 16 unit into the main memory 13. Thus, as a player selects a casino game for game play 17 in the system, the authenticity of that game actually stored in the mass storage unit 18 is automatically checked using the authentication procedure described above without 19 removing the ROM 29. Further, if desired, the authentication procedure may be initiated in response to the pull of a slot game handle, the detection of a coin insert, 21 the payout of coins or issuing of credit, or any other detectable event related to game 22 play. The authenticity of a given casino game data set 36 can also be checked on 23 demand, either locally at the game console or remotely via a network, by providing 24 a demand procedure. Such a procedure may be initiated, e.g. by providing a manually operable switch in the game console, accessible only to authorized persons.
26 for initiating the authentication routine. Alternatively, the Fig. 1 system may be 27 configured to respond to a demand command generated remotely (e.g. in a security 28 area in the casino or off site) and transmitted to the game console over a network to 29 the networking subsystem 21.
Another advantage of the invention lies in the fact that the game data set 31 storage capacity of a system incorporating the invention is not limited by the size of 32 a ROM, but is rather dictated by the size of the mass storage unit. As a consequence_ 33 games using high resolution, high motion video and high quality stereo sound can WO 97/01902 _15_ PCT/US96/10463 1 be designed and played on systems incorporating the invention. Also, since the mass 2 storage unit need not be a read-only device, and need not be physically located in the 3 game console, the invention affords great flexibility in game content, scheduling and 4 changes. For example, to change the graphic images in a particular casino game or set of games, new casino game data sets can be generated along with new signatures 6 and stored in the mass storage unit by either exchanging disk drives, replacing disks 7 (for read only disk units), or writing new data to the media. In the networked mass 8 storage application, these changes can be made to the files controlled by the network 9 file server. Since the casino game data sets must pass the authentication procedure test, either periodically or on demand, corrupted data sets cannot go undetected. Thus 11 the invention opens up the field of electronic casino gaming systems to readily 12 modifiable games with flexible displays and rules, without sacrificing the essential 13 security of such systems. In fact, security is greatly enhanced by the ability of the 14 invention to authenticate all game data sets both regularly (for each handle pull) and at any time (on demand), without interfering with regular game play (unless no " ~,, i o iriazcn occurs netween the two forms of message digest).
17 While the above provides a full and complete disclosure of the preferred 18 embodiments of the invention, various modifications, alternate constructions and 19 equivalents may be employed without departing from the true spirit and scope of the invention. For example, while the RSA public/private key encryption technique is 21 preferred (due to the known advantages of this technique), a single, private key 22 encryption technique may be employed, if desired. In a system using this technique, 23 the single key would be stored in ROM 29 in place of the public key 34.
Also, the 24 message digest 42 and signature 37 for a given application 36 need not be computed from the entire casino game data set. For example, for some casino games it may be 26 desirable to provide a fixed set of rules while permitting future changes in the casino 27 game graphics, sound or both. For such casino games, it may be sufficient to 28 compute the message digest 42 and signature 37 from only the rules portion of the 29 applications program 36. In other cases, it may be desirable or convenient to ' 30 maintain the casino game video and audio portions constant. while allowing future 31 changes to the rules of game play. For casino games of this category, the message 32 digest 42 and signature 37 may be computed from the graphics and sound portions 33 of the application program 36. It may also be desirable to compute a message digest 1 42 and signature 37 from a subset of the rules, graphics or sound portions of a given 2 applications program 36, or from some other subset taken from a given applications 3 program 36. Therefore, the above should not be construed as limiting the scope of 4 the invention, which is defined by the appended claims.
Claims (62)
1. A method of authenticating a data set of a casino-type viewable game, said method comprising the steps of:
(a) providing a data set for a casino game;
(b) computing a first abbreviated bit string unique to the data set;
(c) encrypting the abbreviated bit string to provide a signature;
(d) storing the data set and the signature;
(e) computing a second abbreviated bit string from the stored data set;
(f) decrypting the stored signature to recover the first abbreviated bit string; and (g) comparing the first and second abbreviated bit strings to determine whether the first and second abbreviated bit strings match.
(a) providing a data set for a casino game;
(b) computing a first abbreviated bit string unique to the data set;
(c) encrypting the abbreviated bit string to provide a signature;
(d) storing the data set and the signature;
(e) computing a second abbreviated bit string from the stored data set;
(f) decrypting the stored signature to recover the first abbreviated bit string; and (g) comparing the first and second abbreviated bit strings to determine whether the first and second abbreviated bit strings match.
2. The method of claim 1 wherein said step (b) of computing is performed with a hash function to produce a hash value of the date set, and wherein said first abbreviated bit string comprises the hash value of the data set.
3. The method of claim 2 wherein the hash value comprises a message digest of the data set.
4. The method of claim 1 wherein said step (c) of encrypting is performed using a private encryption key.
5. The method of claim 1 wherein said step (f) of decrypting is performed using a public decryption key.
6. The method of claim 1 wherein said step (c) of encrypting is performed using a private encryption key, and said step (f) of decrypting is performed using a public decryption key.
7. The method of claim 1 wherein said step (e) of computing is performed with a hash function to produce a hash value of the stored data set, and wherein said second abbreviated bit string comprises the hash value of the stored data set.
8. The method of claim 7 wherein the hash value comprises a message digest of the stored data set.
9. The method of claim 1 wherein said step (d) of storing includes the step of storing the data set and the signature in a mass storage device.
10. The method of claim 9 wherein the mass storage device comprises a disk drive unit.
11. The method of claim 9 wherein the mass storage device comprises a CD-ROM unit.
12. The method of claim 9 wherein the mass storage a network storage system.
13. The method of claim 1 wherein said steps (a)-(d) a first site, and wherein steps (e)-(g) are performed at a second site.
14. The method of claim 13 wherein the first site comprises a manufacturing facility, and wherein said second site is a gaming facility.
15. A method of preparing a casino game data set capable of authentication, said method comprising the steps of:
(a) providing a data set for a casino game;
(b) computing a first abbreviated bit string unique to the casino game data set;
(c) encrypting the abbreviated bit string to provide a signature;.and (d) storing the casino game data set and the signature.
(a) providing a data set for a casino game;
(b) computing a first abbreviated bit string unique to the casino game data set;
(c) encrypting the abbreviated bit string to provide a signature;.and (d) storing the casino game data set and the signature.
16. The method of claim 15 wherein said step (b) of computing is performed with a hash function to produce a hash value of the stored casino game data set, and wherein said first abbreviated bit string comprises the hash value of the stored casino game data set.
17. The method of claim 16 wherein the hash value comprises a message digest of the casino game data set.
18. The method of claim 15 wherein said step (c) of encrypting is performed using a private encryption key.
19. The method of claim 15 wherein said step (d) of step of storing the casino game data set and the signature in a mass storage device.
20. The method of claim 19 wherein the mass storage device comprises a disk drive unit.
21. The method of claim 19 wherein the mass storage device comprises a CD-ROM unit.
22. The method of claim 19 wherein the mass storage device comprises a network storage system.
23. A method of authenticating a casino game data set of a casino type viewable game having a signature encrypted from a first abbreviated bit string computed from the casino game data set, said method comprising the steps of:
(a) computing a second abbreviated bit string from the casino game data set;
(b) decrypting the signature to recover the first abbreviated bit string; and (c) comparing the first and second abbreviated bit strings to determine whether the first and second abbreviated bit strings match.
(a) computing a second abbreviated bit string from the casino game data set;
(b) decrypting the signature to recover the first abbreviated bit string; and (c) comparing the first and second abbreviated bit strings to determine whether the first and second abbreviated bit strings match.
24. The method of claim 23 wherein said step (a) of computing is performed with a hash function to produce a hash value of the casino game data set, and wherein said second abbreviated bit string comprises the hash value of the casino game data set.
25. The method of claim 24 wherein the hash value comprises a message digest of the casino game data set.
26. The method of claim 23 wherein said step (b) of decrypting is performed using a public decryption key.
27. An electronic gaming system for providing authentication of a data set of a casino type game, said system comprising:
first means for storing a casino game data set and a signature of said casino game data set, said signature comprising an encrypted version of a unique first abbreviated bit string computed from the casino game data set;
second means for storing an authentication program capable of computing a second abbreviated bit string from the casino game data set stored in said first storing means and capable of decrypting an encrypted signature stored in said first storing means to recover the first abbreviated bit string;
processing means for enabling the authentication program to compute an abbreviated bit string from the casino game data set stored in said first storing means and for enabling the authentication program to decrypt the encrypted signature stored in said first storing means to provide a decrypted abbreviated bit string; and means for comparing the computed second abbreviated bit string with the decrypted abbreviated bit string to determine whether a match is present.
first means for storing a casino game data set and a signature of said casino game data set, said signature comprising an encrypted version of a unique first abbreviated bit string computed from the casino game data set;
second means for storing an authentication program capable of computing a second abbreviated bit string from the casino game data set stored in said first storing means and capable of decrypting an encrypted signature stored in said first storing means to recover the first abbreviated bit string;
processing means for enabling the authentication program to compute an abbreviated bit string from the casino game data set stored in said first storing means and for enabling the authentication program to decrypt the encrypted signature stored in said first storing means to provide a decrypted abbreviated bit string; and means for comparing the computed second abbreviated bit string with the decrypted abbreviated bit string to determine whether a match is present.
28. The system of claim 27 wherein said first storing means comprises a mass storage device.
29. The system of claim 28 wherein said mass storage device comprises a disk drive unit.
30. The system of claim 28 wherein said mass storage device comprises a CD-ROM unit.
31. The method of claim 28 wherein said mass storage device comprises a network storage unit.
32. The system of claim 27 wherein said second storing means comprises a read only memory device.
33. The system of claim 32 wherein said read only memory device comprises an unalterable memory device.
34. The system of claim 32 wherein said read only memory device includes a first portion for storing that portion of said authentication program capable of computing the abbreviated bit string from the casino game data set, and a second portion for storing that part of the authentication program capable of decrypting the encrypted signature.
35. The system of claim 34 wherein said second ROM portion is used to store a decryption key.
36. For use in authenticating a casino game data set and signature encrypted from an original message digest computed from the casino game data set; an unalterable read only memory device having stored therein a message digest computing program corresponding to the message digest program used to compute the original message digest of the casino game data set, and a decryption program and decryption key corresponding to the encryption program and encryption key used to prepare the encrypted signature of the original message digest.
37. The device of claim 36 wherein the message digest computing program comprises a hash function.
38. The device of claim 36 wherein the stored decryption key comprises a public key.
39. The device of claim 36 further including an initial loader program stored in said unalterable read only memory device for ensuring use of the message digest computing program, the decryption program and the decryption key.
40. A method of preparing casino game software information capable of authentication, said method comprising the steps of:
(a) providing software information relating to a casino game;
(b) computing a first abbreviated bit string unique to the casino game software information;
(c) encrypting the abbreviated bit string to provide a signature; and (d) storing the casino game software information and the signature.
(a) providing software information relating to a casino game;
(b) computing a first abbreviated bit string unique to the casino game software information;
(c) encrypting the abbreviated bit string to provide a signature; and (d) storing the casino game software information and the signature.
41. The method of claim 40 wherein said step (b) of computing is performed with a hash function to produce a hash value of the stored casino game software information, and wherein said first abbreviated bit string comprises the hash value of the stored casino game software information.
42. The method of claim 41 wherein the hash value comprises a message digest of the casino game software information.
43. The method of claim 40 wherein said step (c) of encrypting is performed using a private encryption key.
44. The method of claim 40 wherein said step (d) of storing includes the step of storing the casino game software information and the signature in a memory device.
45. A method of authenticating casino game software information having a signature encrypted from a first abbreviated bit string computed from the casino game software information, said method comprising the steps of:
(a) computing a second abbreviated bit string from the casino game software information;
(b) decrypting the signature to recover the first abbreviated bit string; and (c) comparing the first and second abbreviated bit strings to determine whether the first and second abbreviated bit strings match.
(a) computing a second abbreviated bit string from the casino game software information;
(b) decrypting the signature to recover the first abbreviated bit string; and (c) comparing the first and second abbreviated bit strings to determine whether the first and second abbreviated bit strings match.
46. The method of claim 45 wherein said step (a) of computing is performed with a hash function to produce a hash value of the casino game software information, and wherein said second abbreviated bit string comprises the hash value of the casino game software information.
47. The method of claim 46 wherein the hash value comprises a message digest of the casino game software information.
48. The method of claim 45 wherein said step (b) of decrypting is performed using a public decryption key.
49. An electronic gaming system for providing authentication of software information relating to a casino type game, said system comprising:
first means for storing casino game software information and a signature of said casino game software information, said signature comprising an encrypted version of a unique first abbreviated bit string computed from the casino game software information;
second means for storing an authentication program capable of computing a second abbreviated bit string from the casino game software information stored in said first storing means and capable of decrypting an encrypted signature stored in said first storing means to recover the first abbreviated bit string;
processing means for enabling the authentication program to compute an abbreviated bit string from the casino game software information stored in said first storing means and for enabling the authentication program to decrypt the encrypted signature stored in said first storing means to provide a decrypted abbreviated bit string; and means for comparing the computed second abbreviated bit string with the decrypted abbreviated bit string to determine whether a match is present.
first means for storing casino game software information and a signature of said casino game software information, said signature comprising an encrypted version of a unique first abbreviated bit string computed from the casino game software information;
second means for storing an authentication program capable of computing a second abbreviated bit string from the casino game software information stored in said first storing means and capable of decrypting an encrypted signature stored in said first storing means to recover the first abbreviated bit string;
processing means for enabling the authentication program to compute an abbreviated bit string from the casino game software information stored in said first storing means and for enabling the authentication program to decrypt the encrypted signature stored in said first storing means to provide a decrypted abbreviated bit string; and means for comparing the computed second abbreviated bit string with the decrypted abbreviated bit string to determine whether a match is present.
50. The system of claim 49 wherein said first storing means comprises a memory device.
51. The system of claim 50 wherein said memory device comprises a read only memory.
52. The system of claim 50 wherein said memory device comprises a RAM.
53. The system of claim 49 wherein said second storing means comprises a read only memory device.
54. The system of claim 53 wherein said read only memory device comprises an unalterable memory device.
55. The system of claim 53 wherein said read only memory device includes a first portion for storing that portion of said authentication program capable of computing the abbreviated bit string from the casino game software information, and a second portion for storing that part of the authentication program capable of decrypting the encrypted signature.
56. The system of claim 53 wherein said second ROM portion is used to store a decryption key.
57. The system of claim 49 wherein said casino game software information comprises casino game program information.
58. The system of claim 49 wherein said casino game software information comprises a fixed data set.
59. For use in authenticating casino game software information and a signature encrypted from an original message digest computed from the casino game software information; an unalterable read only memory device having stored therein a message digest computing program corresponding to the message digest program used to compute the original message digest of the casino game software information, and a decryption program and decryption key corresponding to the encryption program and encryption key used to prepare the encrypted signature of the original message digest.
60. The device of claim 59 wherein the message digest computing program comprises a hash function.
61. The device of claim 59 wherein the stored decryption key comprises a public key.
62. The device of claim 59 further including an initial loader program stored in said unalterable read only memory device for ensuring use of the message digest computing program, the decryption program and the decryption key.
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PCT/US1996/010463 WO1997001902A1 (en) | 1995-06-29 | 1996-06-17 | Electronic casino gaming system with improved play capacity, authentication and security |
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-
1998
- 1998-06-29 US US09/107,031 patent/US6149522A/en not_active Expired - Lifetime
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2005
- 2005-11-24 JP JP2005338252A patent/JP2006102526A/en active Pending
Also Published As
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ES2357472T3 (en) | 2011-04-26 |
EP0882339A4 (en) | 2002-03-06 |
EP0882339A1 (en) | 1998-12-09 |
WO1997001902A1 (en) | 1997-01-16 |
ZA97320B (en) | 1997-11-26 |
DK0882339T3 (en) | 2011-04-18 |
US6149522A (en) | 2000-11-21 |
TR199701723T1 (en) | 1998-04-21 |
JP2002515765A (en) | 2002-05-28 |
AU6282096A (en) | 1997-01-30 |
ATE496444T1 (en) | 2011-02-15 |
DE69638322D1 (en) | 2011-03-03 |
CN1191644A (en) | 1998-08-26 |
EP0882339B1 (en) | 2011-01-19 |
JP2006102526A (en) | 2006-04-20 |
CA2225805A1 (en) | 1997-01-16 |
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