Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1993-05-05
1995-06-06
Cain, David C.
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
380 30, H04K 100
Patent
active
054229537
ABSTRACT:
A personal data/time notary device is embodied in a token device such as a "smart card". The portable notary device includes an input/output (I/O) port, which is coupled to a single integrated circuit chip. The I/O port may be coupled to a conventional smart card reading device which in turn is coupled to a PC, lap-top computer or the like. A tamper resistant secret private key storage is embodied on the chip. The private key storage is coupled to the processor which, in turn, is coupled to a permanent memory that stores the program executed by the processor. At least one clock is embodied on the card. A second clock 14 and a random value generator 10 are also preferably coupled to the processor. The device combines digital time notarization into a digital signature operation to ensure that a time stamp is always automatically present. The user does not need to be involved in any additional decision making as to whether time stamping is necessary.
REFERENCES:
patent: 4799258 (1989-01-01), Davies
patent: 4837822 (1989-06-01), Crosley et al.
patent: 4974193 (1990-11-01), Beutelspacher et al.
patent: 5001752 (1991-03-01), Fischer
patent: 5136647 (1992-08-01), Haber et al.
Smart Card 2000: The future of IC Cards, D Chaum & I. Schaumuller-Cichl, pp. 139-146, Laxenburg, Austria, Oct. 19-20, 1987.
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