Cryptographic equipment

Details Cryptographic equipment Cryptographic equipment

1988-09-08

1999-03-23

Buczinski, Stephen C.

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

235380, 380 25, G06K 500, H04K 100

Patent

active

058870644

ABSTRACT:
Cryptographic equipment is used with a number of user identification cards which are distributed to various authorized users, each user identification card being a non-volatile memory which can be overwritten in which a user-associated external crypto-ignition key is stored. Insertion of the user identification card in the cryptographic equipment releases the cryptovariable code by cooperation with an internal crypto-ignition key stored internal in a sub-memory of the cryptographic equipment for every authorized user. The cryptovariable required for setting and controlling the cryptosequence generator is stored in encoded form in another sub-memory of the variable memory, and is capable of being decoded with the cryptovariable code.

REFERENCES:
patent: 4694492 (1987-09-01), Wirstrom et al.
patent: 4800590 (1989-01-01), Vaughan
patent: 4885788 (1989-12-01), Takaragi et al.
patent: 4907272 (1990-03-01), Hazard et al.

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