Data exchange system with authentication code comparator
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United States of America Patent
Stats
-
Nov 22, 1988
Grant Date -
N/A
app pub date -
Mar 4, 1988
filing date -
Mar 4, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
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).
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