Circuit arrangement for protecting access to a data processing system with the assistance of a chip card
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United States of America Patent
Stats
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Nov 27, 1990
Grant Date -
N/A
app pub date -
Mar 4, 1988
filing date -
Mar 4, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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