Data communication system
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United States of America Patent
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-
Apr 13, 1993
Grant Date -
N/A
app pub date -
Nov 29, 1991
filing date -
Nov 30, 1990
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
When a final session is performed between a host device and an IC card, common key data stored in the host device is encrypted by an updated session key and transmitted to the IC card in which the encrypted common key data is decrypted by the the same updated session key to obtain the common key data which is stored in the IC card for the following sessions to be performed later.
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