Cryptographic device

Details Cryptographic device Cryptographic device

G - Physics

09

C

354/46

G09C 5/00 (2006.01) H04K 1/00 (2006.01) H04L 9/00 (2006.01)

Patent

CA 1338942

Cryptographic equipment, in which the crypto variable (code) that is to be kept secret is stored in the device, require a security classification that corresponds to the classification of the code to be kept secret. However, use of the cryptographic device is made extremely difficult by this since it must as a rule be kept locked, for example in a safe. In order to give such a cryptographic device a lower security classification than the crypto variable (code) used with it, it is proposed to make the authorization of use of the cryptographic device dependent on user identity cards (UAKn) assigned to various authorized users, the cards being nonvolatile memories that can be overwritten and in which a user-specific external CIK (crypto ignition key) (Xn) is stored which, by linking it to an internal CIK (In) stored for each authorized user internally in a user partial memory (URn) of a variable memory (VSP), results in the crypto variable code (C) with which the crypto variable (V) required for adjusting and controlling the code sequence generator (SFE), the crypto variable being merely stored in a crypto variable partial memory (KVS) in enciphered form, can be deciphered.

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