Circuit arrangement for protecting access to a data processing s

Details Circuit arrangement for protecting access to a data processing s Circuit arrangement for protecting access to a data processing s

1988-03-04

1990-11-27

Heckler, Thomas M.

Boots, shoes, and leggings

3649278, 36494971, 3649694, 235380, 380 25, G06F 300, G06K 500

Patent

active

049741934

ABSTRACT:
Dependent on a variable start value (s), a random number according to the relationship v=f (K;s) is generated from a ciphering algorithm (f) implemented in the microprocessor of the chip card and from a stored secret cipher (K). This random number can be intermediately stored in a register and, when generating a new random number, can be logically operated with a variable input quantity (for example, with the variable start value (s), to form a modified variable start value (s'), for use in establishing protected communications between the chip card and a user terminal having a chip card reader.

REFERENCES:
patent: 4224666 (1980-09-01), Giraud
patent: 4679236 (1987-07-01), Davies
patent: 4746788 (1988-05-01), Kawana
patent: 4786790 (1988-11-01), Kruse et al.
patent: 4819204 (1989-04-01), Schrenk

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