CA2120678A1 - Method for Protecting a Volatile File Using a Single Hash - Google Patents

Method for Protecting a Volatile File Using a Single Hash

Info

Publication number
CA2120678A1
CA2120678A1 CA2120678A CA2120678A CA2120678A1 CA 2120678 A1 CA2120678 A1 CA 2120678A1 CA 2120678 A CA2120678 A CA 2120678A CA 2120678 A CA2120678 A CA 2120678A CA 2120678 A1 CA2120678 A1 CA 2120678A1
Authority
CA
Canada
Prior art keywords
hash
record
file
function
aggregate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2120678A
Other languages
French (fr)
Other versions
CA2120678C (en
Inventor
Addison M. Fischer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=22551646&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=CA2120678(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Individual filed Critical Individual
Publication of CA2120678A1 publication Critical patent/CA2120678A1/en
Application granted granted Critical
Publication of CA2120678C publication Critical patent/CA2120678C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • G06F21/55—Detecting local intrusion or implementing counter-measures
    • G06F21/56—Computer malware detection or handling, e.g. anti-virus arrangements
    • G06F21/562—Static detection
    • G06F21/565—Static detection by checking file integrity
    • 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
    • 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
    • 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

The disclosed methodology permits an insecure computing system to safely perform high security electronic financial transactions. The present invention permits the hash of a file to be taken on an incremental basis. It permits any part of the file to be changed while allowing a new aggregate hash to be computed based on the revised file portion and the prior total hash. The aggregate hash is readily updatable with each record revision without having to recompute the hash of the entire file in accordance with conventional techniques. These objectives using two functions. The first function is an effective one-way hash function "H" for which it is computationally impossible to find two data values that hash to the same result. The second function is a commutative and associative function "F" (and inverse "Finv") and provider a mechanism for combining the aggregate hash and the hash of updated records.
Examples of these latter functions include exclusive OR ("XOR"), and arithmetic addition. The methodology involves combining the hash of each file record and the hash of an identification of the record (i.e., a record number or key). These hashes are combined using a function ("F") whereby individual records may be extracted using the inverse of that function (Finv). In this fashion, an individual record may be extracted from the aggregate hash and updated. With each update, the file hash as computed according to this invention is preferably also written after being encrypted under a key known only to the valid user, or if it is digitally signed by the valid user or if it is held in a tamper resistant storage. Each record is represented by its identification hashed together with its data content. All such record are added together to provide a highly secure integrity check. This aggregate hash reflects the entire database such that the tampering (or rearranging) of any data record is revealed by the use of the record identifier (i.e., record number) in the hash calculation due to its impact on the aggregate hash (e.g., the sum).
CA002120678A 1993-11-19 1994-04-06 Method for protecting a volatile file using a single hash Expired - Fee Related CA2120678C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/154,520 1993-11-19
US08/154,520 US5475826A (en) 1993-11-19 1993-11-19 Method for protecting a volatile file using a single hash

Publications (2)

Publication Number Publication Date
CA2120678A1 true CA2120678A1 (en) 1995-05-20
CA2120678C CA2120678C (en) 1999-08-24

Family

ID=22551646

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002120678A Expired - Fee Related CA2120678C (en) 1993-11-19 1994-04-06 Method for protecting a volatile file using a single hash

Country Status (7)

Country Link
US (2) US5475826A (en)
EP (1) EP0654920B2 (en)
JP (2) JPH0883046A (en)
AT (1) ATE230534T1 (en)
AU (1) AU5778394A (en)
CA (1) CA2120678C (en)
DE (1) DE69431944T3 (en)

Families Citing this family (122)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5475826A (en) * 1993-11-19 1995-12-12 Fischer; Addison M. Method for protecting a volatile file using a single hash
US5687361A (en) * 1995-02-13 1997-11-11 Unisys Corporation System for managing and accessing a dynamically expanding computer database
EP0826181A4 (en) 1995-04-11 2005-02-09 Kinetech Inc Identifying data in a data processing system
US5963924A (en) * 1996-04-26 1999-10-05 Verifone, Inc. System, method and article of manufacture for the use of payment instrument holders and payment instruments in network electronic commerce
US6016484A (en) * 1996-04-26 2000-01-18 Verifone, Inc. System, method and article of manufacture for network electronic payment instrument and certification of payment and credit collection utilizing a payment
US5987140A (en) * 1996-04-26 1999-11-16 Verifone, Inc. System, method and article of manufacture for secure network electronic payment and credit collection
JPH09311806A (en) * 1996-05-24 1997-12-02 Hitachi Ltd Method for detecting illegal update of data
US6263442B1 (en) * 1996-05-30 2001-07-17 Sun Microsystems, Inc. System and method for securing a program's execution in a network environment
US5987132A (en) * 1996-06-17 1999-11-16 Verifone, Inc. System, method and article of manufacture for conditionally accepting a payment method utilizing an extensible, flexible architecture
US6373950B1 (en) 1996-06-17 2002-04-16 Hewlett-Packard Company System, method and article of manufacture for transmitting messages within messages utilizing an extensible, flexible architecture
US5983208A (en) * 1996-06-17 1999-11-09 Verifone, Inc. System, method and article of manufacture for handling transaction results in a gateway payment architecture utilizing a multichannel, extensible, flexible architecture
US5943424A (en) * 1996-06-17 1999-08-24 Hewlett-Packard Company System, method and article of manufacture for processing a plurality of transactions from a single initiation point on a multichannel, extensible, flexible architecture
US6002767A (en) * 1996-06-17 1999-12-14 Verifone, Inc. System, method and article of manufacture for a modular gateway server architecture
US5889863A (en) * 1996-06-17 1999-03-30 Verifone, Inc. System, method and article of manufacture for remote virtual point of sale processing utilizing a multichannel, extensible, flexible architecture
US6072870A (en) * 1996-06-17 2000-06-06 Verifone Inc. System, method and article of manufacture for a gateway payment architecture utilizing a multichannel, extensible, flexible architecture
US6119105A (en) * 1996-06-17 2000-09-12 Verifone, Inc. System, method and article of manufacture for initiation of software distribution from a point of certificate creation utilizing an extensible, flexible architecture
US6026379A (en) * 1996-06-17 2000-02-15 Verifone, Inc. System, method and article of manufacture for managing transactions in a high availability system
US5944821A (en) * 1996-07-11 1999-08-31 Compaq Computer Corporation Secure software registration and integrity assessment in a computer system
US5745900A (en) * 1996-08-09 1998-04-28 Digital Equipment Corporation Method for indexing duplicate database records using a full-record fingerprint
US5931917A (en) 1996-09-26 1999-08-03 Verifone, Inc. System, method and article of manufacture for a gateway system architecture with system administration information accessible from a browser
US6367012B1 (en) 1996-12-06 2002-04-02 Microsoft Corporation Embedding certifications in executable files for network transmission
US5892904A (en) * 1996-12-06 1999-04-06 Microsoft Corporation Code certification for network transmission
US6708274B2 (en) * 1998-04-30 2004-03-16 Intel Corporation Cryptographically protected paging subsystem
US6266771B1 (en) * 1997-02-10 2001-07-24 The Regents Of The University Of California Probabilistic signature scheme
US5996076A (en) * 1997-02-19 1999-11-30 Verifone, Inc. System, method and article of manufacture for secure digital certification of electronic commerce
WO1998045980A2 (en) * 1997-03-10 1998-10-15 Fielder Guy L Secure deterministic encryption key generator system and method
ID22750A (en) * 1997-04-14 1999-12-09 Siemens Ag METHODS AND COMPOSITION IN FORMING AND CHECKING A CALCULATION TOOL FOR DIGITAL DATA GROUPED TO BE A NUMBER OF DATA SEGMENTS
US6065119A (en) * 1997-05-30 2000-05-16 The Regents Of The University Of California Data validation
US6122372A (en) * 1997-06-04 2000-09-19 Signet Assurance Company Llc System and method for encapsulating transaction messages with verifiable data generated identifiers
US6339829B1 (en) * 1998-07-30 2002-01-15 International Business Machines Corporation Method and apparatus to store extended security information in a data structure which shadows a java class object
US8347086B2 (en) 2000-12-18 2013-01-01 Citibank, N.A. System and method for automatically detecting and then self-repairing corrupt, modified of non-existent files via a communication medium
US6460122B1 (en) * 1999-03-31 2002-10-01 International Business Machine Corporation System, apparatus and method for multi-level cache in a multi-processor/multi-controller environment
US6299452B1 (en) * 1999-07-09 2001-10-09 Cognitive Concepts, Inc. Diagnostic system and method for phonological awareness, phonological processing, and reading skill testing
WO2001035253A1 (en) * 1999-11-08 2001-05-17 Usertrust, Inc. Legal-based or fiduciary-based data management process
US7269726B1 (en) * 2000-01-14 2007-09-11 Hewlett-Packard Development Company, L.P. Lightweight public key infrastructure employing unsigned certificates
US7340600B1 (en) 2000-01-14 2008-03-04 Hewlett-Packard Development Company, L.P. Authorization infrastructure based on public key cryptography
US7010683B2 (en) * 2000-01-14 2006-03-07 Howlett-Packard Development Company, L.P. Public key validation service
GB2359955B (en) * 2000-03-01 2003-07-23 3Com Corp Network unit including address hashing
AU2001257077A1 (en) * 2000-04-17 2001-10-30 Brio Technology, Inc. Analytical server including metrics engine
US7080090B2 (en) * 2000-04-27 2006-07-18 Hyperion Solutions Corporation Allocation measures and metric calculations in star schema multi-dimensional data warehouse
US7072897B2 (en) * 2000-04-27 2006-07-04 Hyperion Solutions Corporation Non-additive measures and metric calculation
JP2001346135A (en) * 2000-06-01 2001-12-14 Nikon Gijutsu Kobo:Kk Digital print ordering.generating method and device, and management method for image data
US6865577B1 (en) 2000-11-06 2005-03-08 At&T Corp. Method and system for efficiently retrieving information from a database
US7069594B1 (en) * 2001-06-15 2006-06-27 Mcafee, Inc. File system level integrity verification and validation
US7003672B2 (en) * 2001-09-25 2006-02-21 Hewlett-Packard Development Company, L.P. Authentication and verification for use of software
US8266113B2 (en) * 2003-04-01 2012-09-11 Cybersoft, Inc. Methods, apparatus and articles of manufacture for computer file integrity and baseline maintenance
JP2003223365A (en) * 2002-01-31 2003-08-08 Fujitsu Ltd Data managing mechanism and device having the same mechanism or card
US7624434B2 (en) * 2002-03-01 2009-11-24 3Com Corporation System for providing firewall capabilities to a communication device
JP2004030079A (en) * 2002-06-24 2004-01-29 Fuji Electric Holdings Co Ltd Contents receiving and distribution system
US7337471B2 (en) * 2002-10-07 2008-02-26 Symantec Corporation Selective detection of malicious computer code
US7260847B2 (en) * 2002-10-24 2007-08-21 Symantec Corporation Antivirus scanning in a hard-linked environment
AU2003292300A1 (en) * 2002-10-30 2004-06-07 Thomson Licensing S.A. Simplified method for renewing symmetrical keys in a digital network
US7373664B2 (en) * 2002-12-16 2008-05-13 Symantec Corporation Proactive protection against e-mail worms and spam
US7263720B2 (en) * 2002-12-16 2007-08-28 Intel Corporation Method and mechanism for validating legitimate software calls into secure software
US20040153666A1 (en) * 2003-02-05 2004-08-05 Sobel William E. Structured rollout of updates to malicious computer code detection definitions
US20040158546A1 (en) * 2003-02-06 2004-08-12 Sobel William E. Integrity checking for software downloaded from untrusted sources
US7293290B2 (en) * 2003-02-06 2007-11-06 Symantec Corporation Dynamic detection of computer worms
US7246227B2 (en) * 2003-02-10 2007-07-17 Symantec Corporation Efficient scanning of stream based data
US7546638B2 (en) * 2003-03-18 2009-06-09 Symantec Corporation Automated identification and clean-up of malicious computer code
US7739278B1 (en) * 2003-08-22 2010-06-15 Symantec Corporation Source independent file attribute tracking
EP3043232A1 (en) 2003-08-26 2016-07-13 Panasonic Intellectual Property Corporation of America Program execution device
US20050071640A1 (en) * 2003-09-25 2005-03-31 General Instrument Corporation Method and apparatus for authenticating data
US7519822B2 (en) * 2004-03-10 2009-04-14 Hewlett-Packard Development Company, L.P. Method and apparatus for processing descriptive statements
US7130981B1 (en) 2004-04-06 2006-10-31 Symantec Corporation Signature driven cache extension for stream based scanning
US7861304B1 (en) 2004-05-07 2010-12-28 Symantec Corporation Pattern matching using embedded functions
US7373667B1 (en) 2004-05-14 2008-05-13 Symantec Corporation Protecting a computer coupled to a network from malicious code infections
US7484094B1 (en) 2004-05-14 2009-01-27 Symantec Corporation Opening computer files quickly and safely over a network
US7487353B2 (en) * 2004-05-20 2009-02-03 International Business Machines Corporation System, method and program for protecting communication
US7509680B1 (en) 2004-09-01 2009-03-24 Symantec Corporation Detecting computer worms as they arrive at local computers through open network shares
US7565686B1 (en) 2004-11-08 2009-07-21 Symantec Corporation Preventing unauthorized loading of late binding code into a process
US20060150153A1 (en) * 2004-12-04 2006-07-06 Micah Altman Digital object verification method
US7984018B2 (en) * 2005-04-18 2011-07-19 Microsoft Corporation Efficient point-to-multipoint data reconciliation
GB0510878D0 (en) * 2005-05-27 2005-07-06 Qinetiq Ltd Digital evidence bag
US7975303B1 (en) 2005-06-27 2011-07-05 Symantec Corporation Efficient file scanning using input-output hints
US7895654B1 (en) 2005-06-27 2011-02-22 Symantec Corporation Efficient file scanning using secure listing of file modification times
US8984636B2 (en) 2005-07-29 2015-03-17 Bit9, Inc. Content extractor and analysis system
US8272058B2 (en) 2005-07-29 2012-09-18 Bit 9, Inc. Centralized timed analysis in a network security system
US7895651B2 (en) 2005-07-29 2011-02-22 Bit 9, Inc. Content tracking in a network security system
US8060747B1 (en) * 2005-09-12 2011-11-15 Microsoft Corporation Digital signatures for embedded code
JP3894335B1 (en) * 2005-10-04 2007-03-22 インターナショナル・ビジネス・マシーンズ・コーポレーション Apparatus and method for determining database consistency
US8185576B2 (en) 2006-03-14 2012-05-22 Altnet, Inc. Filter for a distributed network
US7966602B1 (en) * 2006-03-16 2011-06-21 Oracle America, Inc. Incremental modification detector, and methods, systems, and apparatus for implementing the same
US20080033740A1 (en) * 2006-08-04 2008-02-07 Robert Cahn On-line anonymous age verification for controlling access to selected websites
US20080022414A1 (en) 2006-03-31 2008-01-24 Robert Cahn System and method of providing unique personal identifiers for use in the anonymous and secure exchange of data
US7757098B2 (en) * 2006-06-27 2010-07-13 Intel Corporation Method and apparatus for verifying authenticity of initial boot code
US7689547B2 (en) * 2006-09-06 2010-03-30 Microsoft Corporation Encrypted data search
US8510859B2 (en) 2006-09-26 2013-08-13 Intel Corporation Methods and arrangements to launch trusted, co-existing environments
EP1918839A1 (en) * 2006-11-03 2008-05-07 Siemens Aktiengesellschaft Modification of a software version of a control device software for a control device and identification of such a modification
JP5049288B2 (en) * 2006-11-09 2012-10-17 パナソニック株式会社 Tamper detection system, tamper detection method, tamper detection program, recording medium, integrated circuit, authentication information generation device, and tamper detection device
JP2008146601A (en) * 2006-12-13 2008-06-26 Canon Inc Information processor and information processing method
JP4998019B2 (en) * 2007-03-06 2012-08-15 富士通株式会社 Status display controller
US8056118B2 (en) * 2007-06-01 2011-11-08 Piliouras Teresa C Systems and methods for universal enhanced log-in, identity document verification, and dedicated survey participation
US8893241B2 (en) 2007-06-01 2014-11-18 Albright Associates Systems and methods for universal enhanced log-in, identity document verification and dedicated survey participation
US8959584B2 (en) 2007-06-01 2015-02-17 Albright Associates Systems and methods for universal enhanced log-in, identity document verification and dedicated survey participation
US9398022B2 (en) 2007-06-01 2016-07-19 Teresa C. Piliouras Systems and methods for universal enhanced log-in, identity document verification, and dedicated survey participation
US9424266B2 (en) * 2007-10-01 2016-08-23 Microsoft Technology Licensing, Llc Efficient file hash identifier computation
US8156126B2 (en) * 2008-07-14 2012-04-10 Greenbytes, Inc. Method for the allocation of data on physical media by a file system that eliminates duplicate data
TW201105083A (en) 2009-03-25 2011-02-01 Pacid Technologies Llc Token for securing communication
US8934625B2 (en) 2009-03-25 2015-01-13 Pacid Technologies, Llc Method and system for securing communication
US8726032B2 (en) 2009-03-25 2014-05-13 Pacid Technologies, Llc System and method for protecting secrets file
US20110307707A1 (en) 2009-03-25 2011-12-15 Pacid Technologies, Llc Method and system for securing a file
WO2010111448A1 (en) 2009-03-25 2010-09-30 Pacid Technologies, Llc Method and system for securing communication
JP5341209B2 (en) 2009-12-25 2013-11-13 インターナショナル・ビジネス・マシーンズ・コーポレーション System, method and program for checking pointer consistency in hierarchical database
US9075798B2 (en) * 2010-07-30 2015-07-07 Adobe Systems Incorporated Verifying authenticity of input using a hashing algorithm
DE102010061733B4 (en) * 2010-11-22 2022-05-05 Beckhoff Automation Gmbh Procedure for creating a control program
EP2477137A1 (en) 2011-01-12 2012-07-18 Safelayer Secure Communications, S.A. Method for verifying the integrity of a set of data
US8881294B2 (en) 2011-02-18 2014-11-04 Honeywell International Inc. Methods and systems for securely uploading files onto aircraft
US8745750B2 (en) 2011-04-21 2014-06-03 Microsoft Corporation Origination verification using execution transparent marker context
US20120324446A1 (en) * 2011-06-17 2012-12-20 Microsoft Corporation Virtual machine image composition and signing
TWI569614B (en) 2011-08-30 2017-02-01 萬國商業機器公司 Method, appliance, and computer readable medium for processing a session in network communications
US8479021B2 (en) 2011-09-29 2013-07-02 Pacid Technologies, Llc Secure island computing system and method
US20130138969A1 (en) * 2011-11-28 2013-05-30 Mocana Corporation Preventing glitching of a firmware image using one or more layers of randomness
US20130226888A1 (en) * 2012-02-28 2013-08-29 Netapp, Inc. Systems and methods for caching data files
US8806625B1 (en) * 2012-10-02 2014-08-12 Symantec Corporation Systems and methods for performing security scans
CN103778114B (en) 2012-10-17 2016-03-09 腾讯科技（深圳）有限公司 File repair system and method
GB2512373A (en) * 2013-03-28 2014-10-01 Thunderhead Ltd Document tamper detection
DE102016221108A1 (en) * 2016-10-26 2018-04-26 Volkswagen Aktiengesellschaft A method for updating software of a control device of a vehicle
JP6894220B2 (en) * 2016-11-30 2021-06-30 キヤノン電子株式会社 Information processing equipment and its control methods, programs and systems
EP3667505B1 (en) 2018-12-14 2021-11-10 Nxp B.V. Memory system with an incremental hashing operation and method
JP6656446B1 (en) * 2019-03-22 2020-03-04 株式会社ウフル Device management system, device management method, information processing apparatus, and program
US11449548B2 (en) 2019-11-27 2022-09-20 Elasticsearch B.V. Systems and methods for enriching documents for indexing
US11410167B2 (en) * 2019-12-30 2022-08-09 Paypal, Inc. Efficient transaction reconciliation system

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4352952A (en) * 1978-06-12 1982-10-05 Motorola Inc. Data security module
US4290105A (en) * 1979-04-02 1981-09-15 American Newspaper Publishers Association Method and apparatus for testing membership in a set through hash coding with allowable errors
US4588991A (en) * 1983-03-07 1986-05-13 Atalla Corporation File access security method and means
US4868877A (en) * 1988-02-12 1989-09-19 Fischer Addison M Public key/signature cryptosystem with enhanced digital signature certification
US5005200A (en) * 1988-02-12 1991-04-02 Fischer Addison M Public key/signature cryptosystem with enhanced digital signature certification
US5144659A (en) * 1989-04-19 1992-09-01 Richard P. Jones Computer file protection system
JP2668438B2 (en) * 1989-04-21 1997-10-27 三菱電機株式会社 Data retrieval device
US5204966A (en) * 1990-03-09 1993-04-20 Digital Equipment Corporation System for controlling access to a secure system by verifying acceptability of proposed password by using hashing and group of unacceptable passwords
US5136647A (en) * 1990-08-02 1992-08-04 Bell Communications Research, Inc. Method for secure time-stamping of digital documents
EP0483424A1 (en) * 1990-10-30 1992-05-06 International Business Machines Corporation Key hashing in data processors
US5208853A (en) * 1991-09-09 1993-05-04 Motorola, Inc. Method and apparatus for usage protection of data files using split key and unique variable
JPH06102822A (en) * 1991-09-26 1994-04-15 Rooreru Intelligent Syst:Kk File security system
US5297208A (en) * 1992-08-05 1994-03-22 Roger Schlafly Secure file transfer system and method
US5483598A (en) * 1993-07-01 1996-01-09 Digital Equipment Corp., Patent Law Group Message encryption using a hash function
US5319712A (en) * 1993-08-26 1994-06-07 Motorola, Inc. Method and apparatus for providing cryptographic protection of a data stream in a communication system
US5432852A (en) * 1993-09-29 1995-07-11 Leighton; Frank T. Large provably fast and secure digital signature schemes based on secure hash functions
US5475826A (en) * 1993-11-19 1995-12-12 Fischer; Addison M. Method for protecting a volatile file using a single hash

Also Published As

Publication number Publication date
DE69431944D1 (en) 2003-02-06
EP0654920B2 (en) 2007-09-05
AU5778394A (en) 1995-05-25
US5694569A (en) 1997-12-02
DE69431944T3 (en) 2008-05-21
JPH0883046A (en) 1996-03-26
EP0654920B1 (en) 2003-01-02
EP0654920A3 (en) 2000-03-08
US5475826A (en) 1995-12-12
JP2006092574A (en) 2006-04-06
CA2120678C (en) 1999-08-24
EP0654920A2 (en) 1995-05-24
ATE230534T1 (en) 2003-01-15
DE69431944T2 (en) 2008-01-24

Similar Documents

Publication Publication Date Title
CA2120678A1 (en) Method for Protecting a Volatile File Using a Single Hash
RU2351978C2 (en) Method for provision of data records set integrity
US7984025B2 (en) Method for reencryption of a database
US20070168672A1 (en) Digital document management system, digital document management method, and digital document management program
US6968456B1 (en) Method and system for providing a tamper-proof storage of an audit trail in a database
US8090953B2 (en) Information storage system
HUP0102397A2 (en) Method for electronic transmission, storage and retrieval of authenticated documents
US8190915B2 (en) Method and apparatus for detecting data tampering within a database
US20110035360A1 (en) Tools and techniques for original digital files
US7721113B2 (en) Data alteration detecting method, data alteration detecting device and data alteration detecting program
CA2242130A1 (en) Method for parallel approval of documents in a distributed network
KR100910075B1 (en) A data processing apparatus, a method and a recording medium having computer program recorded thereon for processing data
EP1116110B1 (en) Method of creating an inseparable link between an electronic document and ole objects
AU720583B2 (en) A method for protecting data
Xiao et al. VAOFS: A Verifiable Append-Only File System for Regulatory Compliance
HUP0100435A2 (en) The system and method of protection and handling of documents
CA2345147A1 (en) Method of creating an inseparable link between an electronic document and ole objects
CN116167071A (en) Digital asset right-determining registration method and device based on blockchain
Dunlap Computer fraud settled

Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed

Effective date: 20140408