EP0739109A2
Expired / Lapsed
EP
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Method and apparatus for authentication in an electronic locking system
Assignee: Lear Automotive Dearborn Inc
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Filing: 1996-03-26
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Granted: —
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Expires: 2016-03-26
Abstract
Abstract The first and second devices (10, 12) exchange randomly generated messages that are used in a composition-based encryption/decryption process. At least one of the randomly generated messages is, itself, encrypted before transmission. The composition-based process (a cyclic redundancy code process, preferably enhanced with midcycle non-Galois Field operation) is embedded in both devices and not readily discernable by playback attack. <IMAGE>
Inventors
- 👤 Robert E. Labarre
- 👤 Philip J. Koopman, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 03:39
CPC Classifications
H; H04; H04L; H04L9/00; H04L9/32; H04L9/3271; H04L9/08; H04L9/0816; H04L9/0819; H04L9/0822; H04L9/0861; H04L9/0869; H04L9/0894; H04L9/14; H04L9/16; H04L2209/00; H04L2209/04; H04L2209/043; H04L2209/80; H04L2209/84
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
137 words
An attack resistant process for authenticating an access dialog between a first device and a second device in an electronic locking system, the process comprising the steps of: at said first device: generating a random first clocking key; encrypting said first clocking key to produce an encrypted clocking key; communicating said encrypted clocking key to said second device; and using said first clocking key to perform a composition process to generate a first response code; at said second device: decrypting said encrypted clocking key to recover a second clocking key; and using said second clocking key to perform said composition process to generate a second response code; and at least one of said first and second devices: comparing said first and second response codes and authenticating said access dialog if said first and second response codes match.
Claim 2
Dependent Claim
171 words
An attack resistant process for authenticating an access dialog between a first device and a second device in an electronic locking system, the process comprising the steps of: at said second device: generating a random message; and communicating said message to said first device; at said first device: generating a random first clocking key; encrypting said first clocking key to produce an encrypted clocking key; communicating said encrypted clocking key to said second device; receiving said message from said second device; using said first clocking key and said message to perform a composition process to generate a first response code; and communicating said first response code to said second device; and at said second device: receiving said first response code; decrypting said encrypted clocking key to recover a second clocking key; using said second clocking key and said message to perform said composition process to generate a second response code; and comparing said first and second response codes and authenticating said access dialog if said first and second response codes match.
Claim 3
Dependent Claim
31 words
The process according to either one of Claims 1 and 2 wherein said step of decrypting said encrypted clocking key recovers a second clocking key identical to said first clocking key.
Claim 4
Dependent Claim
23 words
The process according to any one of the preceding claims wherein said random first clocking key is generated using a pseudo-random number generator.
Claim 5
Dependent Claim
22 words
The process according to any one of Claims 1 to 3 wherein said random first clocking key is generated using thermal noise.
Claim 6
Dependent Claim
18 words
The process according to any one of the preceding claims wherein said composition process comprises a CRC process.
Claim 7
Dependent Claim
20 words
The process according to any one of Claims 1 to 5 wherein said composition process comprises an enhanced CRC process.
Claim 8
Dependent Claim
45 words
The process according to any one of the preceding claims wherein one of said first and second devices is coupled to a vehicle entry system, and said process further comprises the step of: unlocking said vehicle entry system in response to authenticating said access dialog.
Claim 9
Dependent Claim
45 words
The process according to any one of the preceding claims wherein one of said first and second devices is coupled to a vehicle ignition system, and said process further comprises the step of: enabling said vehicle ignition system in response to authenticating said access dialog.
Claim 10
Dependent Claim
136 words
An electronic locking apparatus comprising: a first device comprising: a random number generator for generating an n-bit first clocking key; an encryption system for encrypting said n-bit first clocking key; a first transmitter for transmitting said encrypted n-bit first clocking key; a first receiver; and a first composition processor for generating a first response code based on said n-bit first clocking key; a second device comprising: a second receiver for receiving said encrypted n-bit first clocking key; decryption system for recovering a second clocking key from said received encrypted n-bit first clocking key; and a second composition processor for generating a second response code based on said second clocking key; and an authentication system for comparing said first and second response codes and for unlocking said locking apparatus of said first and second response codes match.
Claim 11
Dependent Claim
43 words
The apparatus of Claim 10 wherein said second device further has: a message generator for generating an n-bit message; and a second transmitter for transmitting said n-bit message; wherein said first composition processor generates said first response code based on the n-bit message.
Claim 12
Dependent Claim
26 words
The apparatus of Claim 10 wherein said authentication system comprises an authentication comparator, and said first transmitter transmits said first response code to said authentication comparator.
Claim 13
Independent Claim
25 words
The apparatus according to any one of Claims 10 to 12 wherein said random number generator uses thermal noise to produce said first clocking key.
Claim 14
Independent Claim
21 words
The apparatus according to any one of Claims 10 to 12 wherein said random number generator is a pseudo-random number generator.
Claim 15
Independent Claim
20 words
The apparatus according to any one of Claims 10 to 14 wherein said first composition processor is a CRC processor.
Claim 16
Independent Claim
21 words
The apparatus according to any one of Claims 10 to 14 wherein said first composition processor is an enhanced CRC processor.
Claim 17
Independent Claim
19 words
The apparatus according to any one of Claims 10 to 16 wherein said second composition processor is CRC processor.
Claim 18
Independent Claim
21 words
The apparatus according to any one of Claims 10 to 16 wherein said second composition processor is an enhanced CRC processor.
Claim 19
Independent Claim
21 words
The apparatus according to any one of Claims 10 to 18 wherein said electronic locking apparatus comprises a vehicle entry system.
Claim 20
Independent Claim
23 words
The apparatus according to any one of Claims 10 to 19 wherein said electronic locking apparatus enables and disables the vehicle ignition system.
References Cited (Backward Citations)
No citation records indexed.
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