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 Data exchange system comprising a plurality of user terminals each containing a chip card reading device

Details
Inventors: Kruse, Dietrich; Beutelspacher, Albrecht; Kersten, Annette-Gabriele;
Assignee: Siemens Aktiengesellschaft (Berlin and Munich, DE)
Primary Examiner: Heckler; Thomas M.
Assistant Examiner:
Attorney, Agent or Firm: Hill, Van Santen, Steadman & Simpson

A secret cipher (Ki) that is the same for all user terminals is formed of two sub-components (KTi, KT'i) whereof the one sub-component (KTi) is deposited in an erasable, programmable read-only memory (EEPROM). For the second sub-component (KT'i), an encoded data block (E(KT'i)) is transmitted from the outside to a decoder means (DEC) provided in the security module, the decoded output signal thereof being deposited as second sub-component (KT'i) in a first sub-area of a write-read memory (RAM) present in the security module of the user terminal. An overall cipher (Ki) is calculated from the two sub-components (KTi, KT'i) and the result is deposited in a second sub-area of the write-read memory (RAM).

DETAILED DESCRIPTION The object of the present invention, then, is to find an optimum solution for the protection of a global secret cipher that makes it practically impossible to ferret out the respectively valid global cipher.
This object is inventively achieved by using a secret cipher which is divided into two parts.
Advantageous developments of the ivnention are recited in the subclaims.
By splitting up the secret cipher into two subcomponents whereof one sub-component is variable, correspondingly different, new secret ciphers can be derived in the periodic or regular re-formation of the variable part, so that, even if a cipher is ferreted out, this discovered cipher will very soon be superceded and thus, will be unusable.
The secret cipher may be used in the authentication of chip cards, to protect access to the data exchange system.


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