Access system with possibility of learing unknown access keys

• US 20020049904A1
• Filed: 08/22/2001
• Published: 04/25/2002
• Est. Priority Date: 08/24/2000
• Status: Abandoned Application

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Nowottnick, Juergen, Scholze, Steffen
• Application Number:
  US09/935,237
• Publication Number:
  US 20020049904A1
• Time in Patent Office: Days
• US Class Current: 713/169
• CPC Class Codes: G07C 2009/00404 starting with prompting the lock
• CPC Class Codes: G07C 2009/00412 the transmitted data signal being encrypted
• CPC Class Codes: G07C 2009/00888 programming by learning
• CPC Class Codes: G07C 9/00309 operated with bidirectional data transmission between data carrier and locks
• CPC Class Codes: G07C 9/00857 where the code of the data carrier can be programmed
• CPC Class Codes: H04L 2209/84 Vehicles
• CPC Class Codes: H04L 9/0662 with particular pseudorandom sequence generator
• CPC Class Codes: H04L 9/3273 for mutual authentication network architectures or network communication protocols for achieving mutual authentication in a packet data network H04L63/0869

Abstract

An access system with original, authorized access keys (2) is described, wherein the access system and the original access keys (2) comprise pseudo-random generators supplying an identical, secret cryptographic key, an identical cryptographic algorithm and identical numerical sequences, which are usable for mutual authentication in a challenge-response method. For the purpose of learning one or more additional, non-original access keys (4) comprising a pseudo-random generator supplying equal numerical sequences,

an authentication is performed at the access system (1) with an original access key (2),

the access system (1) and an additional access key (4) to be learnt are set to a learning mode,

the access key (4) to be learnt transmits its individual identifier identifying the access key (4) to the access system (1),

the access system (1) transmits the secret cryptographic key encrypted by means of a number supplied by its pseudo-random generator to the access key (4) to be learnt, which decrypts and stores this key by means of the same number supplied by its pseudo-random generator, and

the access system (1) stores the identifier of the learnt access key (4) and performs a mutual authentication with the learnt access key (4) which is subsequently usable as an access key.

Claims

1. An access system (1) with original, authorized access keys (2), the access system (1) and the original access keys (2) comprising pseudo-random generators supplying an identical, secret cryptographic key, an identical cryptographic algorithm and identical numerical sequences, which are usable for mutual authentication in a challenge-response method, wherein, for the purpose of learning one or more additional, non-original access keys (4) comprising a pseudo-random generator supplying equal numerical sequences,

an authentication is performed at the access system (1) with an original access key (2),

the access system (1) and an additional access key (4) to be learnt are set to a learning mode,

the access key (4) to be learnt transmits its individual identifier identifying the access key (4) to the access system (1),

the access system (1) transmits the secret cryptographic key encrypted by means of a number supplied by its pseudo-random generator to the access key (4) to be learnt, which decrypts and stores this key by means of the same number supplied by its pseudo-random generator, and

the access system (1) stores the identifier of the learnt access key (4) and performs a mutual authentication with the learnt access key (4) which is subsequently usable as an access key.

2. An access system as claimed in claim 1, characterized in that, after the access system (1) itself has been set to the learning mode, said system sets the access key (4) to be learnt to the learning mode by means of a command.

3. An access system as claimed in claim 1, characterized in that only given, predetermined access keys in the access system (1) are authorized to trigger learning of additional, non-original access keys (4).

4. An access system as claimed in claim 1, characterized in that the cryptographic algorithms provided in the access system (1) and the access keys (2, 4) are used as pseudo-random generators.

5. An access system as claimed in claim 1, characterized in that authorization of newly learnt access keys (4) in the access system (1) can be withdrawn by erasing their identifiers stored in the access system (1) are erased.

6. An access system as claimed in claim 1, characterized in that the access system (1) can be set to the learning mode by means of a predetermined sequence of operations.

7. Use of the access system as claimed in any one of claims 1 to 6 in a motor vehicle.