CA2465270A1 - Secure communication with a keyboard or related device - Google Patents
Secure communication with a keyboard or related device Download PDFInfo
- Publication number
- CA2465270A1 CA2465270A1 CA002465270A CA2465270A CA2465270A1 CA 2465270 A1 CA2465270 A1 CA 2465270A1 CA 002465270 A CA002465270 A CA 002465270A CA 2465270 A CA2465270 A CA 2465270A CA 2465270 A1 CA2465270 A1 CA 2465270A1
- Authority
- CA
- Canada
- Prior art keywords
- keyboard
- initial value
- nonce
- component
- key
- 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
- H04M1/724—User interfaces specially adapted for cordless or mobile telephones
- H04M1/72448—User interfaces specially adapted for cordless or mobile telephones with means for adapting the functionality of the device according to specific conditions
- H04M1/72454—User interfaces specially adapted for cordless or mobile telephones with means for adapting the functionality of the device according to specific conditions according to context-related or environment-related conditions
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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
- G06F21/70—Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer
- G06F21/82—Protecting input, output or interconnection devices
- G06F21/83—Protecting input, output or interconnection devices input devices, e.g. keyboards, mice or controllers thereof
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
- A61P31/04—Antibacterial agents
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/02—Alarms for ensuring the safety of persons
- G08B21/04—Alarms for ensuring the safety of persons responsive to non-activity, e.g. of elderly persons
- G08B21/0407—Alarms for ensuring the safety of persons responsive to non-activity, e.g. of elderly persons based on behaviour analysis
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
- H04M1/724—User interfaces specially adapted for cordless or mobile telephones
- H04M1/72448—User interfaces specially adapted for cordless or mobile telephones with means for adapting the functionality of the device according to specific conditions
- H04M1/72457—User interfaces specially adapted for cordless or mobile telephones with means for adapting the functionality of the device according to specific conditions according to geographic location
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- 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
- G06F2221/2107—File encryption
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M2201/00—Electronic components, circuits, software, systems or apparatus used in telephone systems
- H04M2201/34—Microprocessors
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M2201/00—Electronic components, circuits, software, systems or apparatus used in telephone systems
- H04M2201/36—Memories
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M2250/00—Details of telephonic subscriber devices
- H04M2250/10—Details of telephonic subscriber devices including a GPS signal receiver
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M2250/00—Details of telephonic subscriber devices
- H04M2250/12—Details of telephonic subscriber devices including a sensor for measuring a physical value, e.g. temperature or motion
Abstract
Secure communication between a keyboard and a component, such as a piece of software running on a computer. A first initial value is known to both the keyboard and the component.
The keyboard and the component exchange nonces. The keyboard and the component each compute a second initial value and a third initial value based on the nonces and the first initial value. Both the keyboard and the component perform the same computation, so that the keyboard and the component each have the same second and third initial values. The keyboard encrypts keystrokes destined for the component using CBC-3DES based on the key and the second initial value, and also creates a message authentication code for each keystroke using based on the key and the third initial value. The component decrypts and verifies the keystrokes using the key and the second and third initial values.
The keyboard and the component exchange nonces. The keyboard and the component each compute a second initial value and a third initial value based on the nonces and the first initial value. Both the keyboard and the component perform the same computation, so that the keyboard and the component each have the same second and third initial values. The keyboard encrypts keystrokes destined for the component using CBC-3DES based on the key and the second initial value, and also creates a message authentication code for each keystroke using based on the key and the third initial value. The component decrypts and verifies the keystrokes using the key and the second and third initial values.
Claims (30)
1. A method of communicating with a keyboard comprising:
receiving, at a component from a keyboard, a plurality of data that have been encrypted with triple-DES and cipher block chaining using a key and a first initial value, said key and said first initial value being known both to the component and to the keyboard;
decrypting the plurality of data based on said first initial value and said key.
receiving, at a component from a keyboard, a plurality of data that have been encrypted with triple-DES and cipher block chaining using a key and a first initial value, said key and said first initial value being known both to the component and to the keyboard;
decrypting the plurality of data based on said first initial value and said key.
2. The method of claim 1, further comprising:
receiving at the component from the keyboard, a plurality of message authentication codes corresponding to the plurality of data, said message authentication codes having been created with triple-DES and cipher block chaining using said key and a second initial value different from said first initial value, said second initial value being known both to the component and to the keyboard;
verifying the plurality of data by using the plurality of message authentication codes.
receiving at the component from the keyboard, a plurality of message authentication codes corresponding to the plurality of data, said message authentication codes having been created with triple-DES and cipher block chaining using said key and a second initial value different from said first initial value, said second initial value being known both to the component and to the keyboard;
verifying the plurality of data by using the plurality of message authentication codes.
3. The method of claim 2, further comprising:
receiving a first nonce from the keyboard;
sending a second nonce to the keyboard; and creating the first initial value and the second initial value by applying triple-DES
and cipher block chaining to a combination of the first nonce and the second nonce, using the key and a third initial value that is known both to the keyboard and to the component.
receiving a first nonce from the keyboard;
sending a second nonce to the keyboard; and creating the first initial value and the second initial value by applying triple-DES
and cipher block chaining to a combination of the first nonce and the second nonce, using the key and a third initial value that is known both to the keyboard and to the component.
4. The method of claim 2, further comprising:
receiving a first nonce from the keyboard;
sending a second nonce to the keyboard;
creating the first initial value by applying triple-DES and cipher block chaining to a combination of the first nonce and the second nonce, using the key and a third initial value that is known both to the keyboard and to the component; and creating the second initial value by applying triple-DES and cipher block chaining to a combination of the first nonce and the second nonce, using the key and a fourth initial value that is known both to the keyboard and to the component.
receiving a first nonce from the keyboard;
sending a second nonce to the keyboard;
creating the first initial value by applying triple-DES and cipher block chaining to a combination of the first nonce and the second nonce, using the key and a third initial value that is known both to the keyboard and to the component; and creating the second initial value by applying triple-DES and cipher block chaining to a combination of the first nonce and the second nonce, using the key and a fourth initial value that is known both to the keyboard and to the component.
5. The method of claim 1, wherein the plurality of data are received through a channel whose behavioral integrity is not trusted by the component.
6. The method of claim 5, wherein the component comprises a first operating system which executes on a computing device along with a second operating system, the first operating system distrusting, in at least some respect, the behavior of the second operating system, the keyboard communicating with the first operating system through a driver controlled by the second operating system.
7. The method of claim 1, wherein the keyboard comprises a USB keyboard.
8. The method of claim 7, wherein said triple-DES and cipher block chaining encrypt data in blocks having a predetermined size, and wherein the keyboard communicates data in blocks of said predetermined size.
9. The method of claim 1, wherein each of the plurality of data is generated based on an individual keystroke received at the keyboard.
10. The method of claim 1, further comprising:
receiving a first nonce from the keyboard;
sending a second nonce to the keyboard; and creating the first initial value by applying triple-DES and cipher block chaining to a combination of the first nonce and the second nonce, using the key and a second initial value that is known both to the keyboard and to the component.
receiving a first nonce from the keyboard;
sending a second nonce to the keyboard; and creating the first initial value by applying triple-DES and cipher block chaining to a combination of the first nonce and the second nonce, using the key and a second initial value that is known both to the keyboard and to the component.
11. A computer-readable medium encoded with computer-executable instructions to perform a method of securely receiving input at a component from a keyboard, the method comprising:
receiving, at the component from the keyboard, a plurality of encrypted keystrokes, the encrypted.keystrokes having been created at the keyboard by encrypting input keystrokes received at the keyboard with triple-DES and cipher block chaining using a key and a first initial value, the key and the first initial value being available both to the keyboard and to the component; and at the component, decrypting the plurality of encrypted keystrokes using the key and the first initial value.
receiving, at the component from the keyboard, a plurality of encrypted keystrokes, the encrypted.keystrokes having been created at the keyboard by encrypting input keystrokes received at the keyboard with triple-DES and cipher block chaining using a key and a first initial value, the key and the first initial value being available both to the keyboard and to the component; and at the component, decrypting the plurality of encrypted keystrokes using the key and the first initial value.
12. The computer-readable medium of claim 11, wherein the component comprises a first operating system which executes on a computing device along with a second operating system, the first operating system distrusting, in at least some respect, the behavior of the second operating system, the keyboard communicating with the first operating system through a driver controlled by the second operating system.
13. The computer-readable medium of claim 11, wherein the method further comprises:
receiving at the component from the keyboard, a plurality of message authentication codes corresponding to the plurality of encrypted keystrokes, said message authentication codes having been created with triple-DES and cipher block chaining using said key and a second initial value different from said first initial value, said second initial value being known both to the component and to the keyboard;
verifying the plurality of encrypted keystrokes by using the plurality of message authentication codes.
receiving at the component from the keyboard, a plurality of message authentication codes corresponding to the plurality of encrypted keystrokes, said message authentication codes having been created with triple-DES and cipher block chaining using said key and a second initial value different from said first initial value, said second initial value being known both to the component and to the keyboard;
verifying the plurality of encrypted keystrokes by using the plurality of message authentication codes.
14. The computer-readable medium of claim 13, wherein the method further comprises:
receiving a first nonce from the keyboard;
sending a second nonce to the keyboard; and creating the first initial value and the second initial value by applying triple-DES
and cipher block chaining to a combination of the first nonce and the second nonce, using the key and a third initial value that is known both to the keyboard and to the component.
receiving a first nonce from the keyboard;
sending a second nonce to the keyboard; and creating the first initial value and the second initial value by applying triple-DES
and cipher block chaining to a combination of the first nonce and the second nonce, using the key and a third initial value that is known both to the keyboard and to the component.
15. The computer-readable medium of claim 13, wherein the method further comprises:
receiving a first nonce from the keyboard;
sending a second nonce to the keyboard;
creating the first initial value by applying triple-DES and cipher block chaining to a combination of the first nonce and the second nonce, using the key and a third initial value that is known both to the keyboard and to the component; and creating the second initial value applying triple-DES and cipher block chaining to a combination of the first nonce and the second nonce, using the key and a fourth initial value that is known both to the keyboard and to the component.
receiving a first nonce from the keyboard;
sending a second nonce to the keyboard;
creating the first initial value by applying triple-DES and cipher block chaining to a combination of the first nonce and the second nonce, using the key and a third initial value that is known both to the keyboard and to the component; and creating the second initial value applying triple-DES and cipher block chaining to a combination of the first nonce and the second nonce, using the key and a fourth initial value that is known both to the keyboard and to the component.
16. The computer-readable medium of claim 11, wherein said triple-DES and cipher block chaining encrypt data in blocks having a predetermined size, and wherein the keyboard communicates data in blocks of said predetermined size.
17. A keyboard comprising:
one or more storage locations that store a first initial value and a key;
an encryption component that encrypts input data received at the keyboard with triple-DES and cipher block chaining using said key and said first initial value, whereby encrypted data is created based on said input data; and a communication interface that communicates said encrypted data to a device external to the keyboard, said encrypted data being destined for a recipient that knows said first initial value and said key.
one or more storage locations that store a first initial value and a key;
an encryption component that encrypts input data received at the keyboard with triple-DES and cipher block chaining using said key and said first initial value, whereby encrypted data is created based on said input data; and a communication interface that communicates said encrypted data to a device external to the keyboard, said encrypted data being destined for a recipient that knows said first initial value and said key.
18. The keyboard of claim 17, wherein the encryption component further creates a plurality of message authentication codes corresponding to the encrypted data or the input data, said message authentication codes having been created with triple-DES and cipher block chaining using said key and a second initial value different from said first initial value.
19. The keyboard of claim 17, wherein the keyboard comprises a USB keyboard.
20. The keyboard of claim 17, wherein the communication interface communicates said encrypted data to a driver that is controlled by a first operating system that executes on said device whereupon said encrypted data is communicated to said recipient, said recipient being a second operating system that executes on said device or a program that executes under said second operating system, said second operating system distrusting, in at least some respect, the behavior of the first operating system.
21. The keyboard of claim 17, wherein said encryption component is adapted to:
receive a first nonce from the recipient through the communication interface;
send a second nonce to the recipient through the communication interface; and create the first initial value by applying triple-DES and cipher block chaining to a combination of the first nonce and the second nonce, using the key and a second initial value that is known both to the keyboard and to the component.
receive a first nonce from the recipient through the communication interface;
send a second nonce to the recipient through the communication interface; and create the first initial value by applying triple-DES and cipher block chaining to a combination of the first nonce and the second nonce, using the key and a second initial value that is known both to the keyboard and to the component.
22. The keyboard of claim 17, wherein the input data received at the keyboard comprises a plurality of individual keystrokes, and wherein the encryption component separately encrypts each of the individual keystrokes.
23. A computer-readable medium encoded with computer-executable instructions to perform a method of enabling a keyboard to engage in secure communication with a component external to the keyboard, the method comprising:
receiving a plurality of input keystrokes;
encrypting each of the input keystrokes with triple-DES and cipher block chaining using a key and a first initial value, the key and the first initial value being known to both the keyboard and the component, whereby a plurality of encrypted keystrokes; and transmitting the encrypted keystrokes to the component.
receiving a plurality of input keystrokes;
encrypting each of the input keystrokes with triple-DES and cipher block chaining using a key and a first initial value, the key and the first initial value being known to both the keyboard and the component, whereby a plurality of encrypted keystrokes; and transmitting the encrypted keystrokes to the component.
24. The computer-readable medium of claim 23, wherein said triple-DES and cipher block chaining encrypt data in blocks having a predetermined size, and wherein the keyboard communicates data in blocks of said predetermined size.
25. The computer-readable medium of claim 23, wherein the method further comprises:
creating a plurality of message authentication codes with triple-DES and cipher block chaining using said key and a second initial value different from said first initial value, the plurality of message authentication codes corresponding to the plurality of keystrokes; and transmitting the message authentication codes to the component.
creating a plurality of message authentication codes with triple-DES and cipher block chaining using said key and a second initial value different from said first initial value, the plurality of message authentication codes corresponding to the plurality of keystrokes; and transmitting the message authentication codes to the component.
26. The computer-readable medium of claim 23, wherein the method further comprises:
sending a first nonce to the component;
sending a second nonce to the component; and creating the first initial value by applying triple-DES and cipher block chaining to a combination of the first nonce and the second nonce, using the key and a second initial value that is known both to the keyboard and to the component.
sending a first nonce to the component;
sending a second nonce to the component; and creating the first initial value by applying triple-DES and cipher block chaining to a combination of the first nonce and the second nonce, using the key and a second initial value that is known both to the keyboard and to the component.
27. A method of enabling data to be inputted securely to a software component comprising:
distributing a copy of the software component, the software component comprising:
a key;
an first initial value; and computer-executable instructions that enable the software to:
send a first nonce to a keyboard;
receive a second nonce from the keyboard;
create a second initial value based on said first nonce, said second nonce, and said first initial value; and decrypt encrypted data received from the keyboard using the key and the second initial value; and distributing; or enabling the distribution of, the keyboard, the keyboard comprising:
hardware to store or access a copy of the key;
hardware to store or access a copy of the first initial value;
hardware or software that enables the keyboard to:
receive the first nonce from the software component;
send the second nonce to the software component; and create the second initial value based on said first nonce, said second nonce, and said first initial value; and create the encrypted data by encrypting input data received at the keyboard using the key and the second initial value.
distributing a copy of the software component, the software component comprising:
a key;
an first initial value; and computer-executable instructions that enable the software to:
send a first nonce to a keyboard;
receive a second nonce from the keyboard;
create a second initial value based on said first nonce, said second nonce, and said first initial value; and decrypt encrypted data received from the keyboard using the key and the second initial value; and distributing; or enabling the distribution of, the keyboard, the keyboard comprising:
hardware to store or access a copy of the key;
hardware to store or access a copy of the first initial value;
hardware or software that enables the keyboard to:
receive the first nonce from the software component;
send the second nonce to the software component; and create the second initial value based on said first nonce, said second nonce, and said first initial value; and create the encrypted data by encrypting input data received at the keyboard using the key and the second initial value.
28. The method of claim 27, wherein said keyboard further comprises hardware or software that enables the keyboard to:
create a third initial value based on said first nonce, said second nonce, and said first initial value, said third initial value being different from said second initial value;
and create a message authentication code using the key and the third initial value;
the software component further comprises computer-executable instructions to:
create said third initial value based on said first nonce, said second nonce, and said first initial value; and verify the message authenticate code using the key and the third initial value.
create a third initial value based on said first nonce, said second nonce, and said first initial value, said third initial value being different from said second initial value;
and create a message authentication code using the key and the third initial value;
the software component further comprises computer-executable instructions to:
create said third initial value based on said first nonce, said second nonce, and said first initial value; and verify the message authenticate code using the key and the third initial value.
29. The method of claim 27, wherein the encrypted data is created by applying triple-DES with cipher block chaining to the input data using the key and the second initial value.
30. The method of claim 27, wherein the keyboard is adapted to encrypt each keystroke individually.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/428,675 US7243237B2 (en) | 2003-05-02 | 2003-05-02 | Secure communication with a keyboard or related device |
| US10/428,675 | 2003-05-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2465270A1 true CA2465270A1 (en) | 2004-11-02 |
| CA2465270C CA2465270C (en) | 2011-06-14 |
Family
ID=32990487
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2465270A Expired - Fee Related CA2465270C (en) | 2003-05-02 | 2004-04-27 | Secure communication with a keyboard or related device |
Country Status (18)
| Country | Link |
|---|---|
| US (1) | US7243237B2 (en) |
| EP (1) | EP1473615B1 (en) |
| JP (1) | JP4459703B2 (en) |
| KR (1) | KR100996737B1 (en) |
| CN (1) | CN1599311B (en) |
| AT (1) | ATE504885T1 (en) |
| AU (1) | AU2004201802B2 (en) |
| BR (1) | BRPI0401684B1 (en) |
| CA (1) | CA2465270C (en) |
| DE (1) | DE602004032085D1 (en) |
| ES (1) | ES2361074T3 (en) |
| HK (1) | HK1069463A1 (en) |
| MX (1) | MXPA04004144A (en) |
| MY (1) | MY137940A (en) |
| PL (1) | PL1473615T3 (en) |
| RU (1) | RU2371756C2 (en) |
| TW (1) | TWI319536B (en) |
| ZA (1) | ZA200403290B (en) |
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| AU2004201802A1 (en) | 2004-11-18 |
| MXPA04004144A (en) | 2005-06-08 |
| BRPI0401684B1 (en) | 2018-04-17 |
| US20040230805A1 (en) | 2004-11-18 |
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| EP1473615A3 (en) | 2006-11-29 |
| CN1599311B (en) | 2011-08-24 |
| RU2004113566A (en) | 2005-10-27 |
| ZA200403290B (en) | 2005-11-08 |
| RU2371756C2 (en) | 2009-10-27 |
| AU2004201802B2 (en) | 2010-01-21 |
| EP1473615A2 (en) | 2004-11-03 |
| KR100996737B1 (en) | 2010-11-25 |
| DE602004032085D1 (en) | 2011-05-19 |
| US7243237B2 (en) | 2007-07-10 |
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| KR20040094379A (en) | 2004-11-09 |
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