Smart card and smart card locking process therefor

Details Smart card and smart card locking process therefor Smart card and smart card locking process therefor

1995-08-29

1997-10-28

Hajec, Donald T.

Registers

Records

Conductive

380 4, G06K 500

Patent

active

056820313

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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