Smart card and smart card locking process therefor
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United States of America Patent
Stats
-
Oct 28, 1997
Grant Date -
N/A
app pub date -
Aug 29, 1995
filing date -
May 6, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A smart card and method of locking a smart card to block the operation of at least one protected program stored in a read-only memory or ROM of the smart card, the smart card incorporating a central processor, the ROM, an erasable programmable read-only memory or EPROM and a random access memory or RAM, the method comprising the steps of: entering a logic lock in the EPROM, making multiple copies of the logic lock in the EPROM, and carrying out a logic OR on the logic lock and the multiple copies in order to block the performance of the protected program upon the detection of either (a) the logic lock or (b) at least one of the multiple copies.
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