Data exchange system with authentication code comparator

Details Data exchange system with authentication code comparator Data exchange system with authentication code comparator

1988-03-04

1988-11-22

Pitts, Harold I.

Registers

Systems controlled by data bearing records

Credit or identification card systems

G06K 500

Patent

active

047867906

ABSTRACT:
A random number (v) generated in a customer chip card (KK) selects individual program parts (Pv) from the sensitive program data (P) for the data flow control, selecting these both in the customer card as well as in a customer terminal (KT). A respective authentication code (PACv) is formed from these program parts (Pv) with the assistance of an authentication algorithm (f) and of a secret cipher (KPC) and, finally, the authentication code (PACv) calculated in the customer chip card (KK) and the authentication code (PACv) calculated in the customer terminal (KT) are checked for identity in a comparison means (COMP) provided in the customer card (KK).

REFERENCES:
patent: 4295039 (1981-10-01), Stuckert

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