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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
First Claim
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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.

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