Counterfeit-proof identification card

Cryptography – Particular algorithmic function encoding – Nbs/des algorithm

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380 4, 380 9, 380 23, 380 24, 380 30, 380 49, 235379, 235380, H04L 900, H04L 930

Patent

active

056944713

ABSTRACT:
A system and method for preventing counterfeiting of an identification or transaction card, and for verifying that the user of the card is an authorized user, involves the use of a unique, unalterable serial number and an exclusive OR function to generate a private key protected digital signature. The digital signature is stored on the card together with a card issuer record which contains sufficient information to authenticate the record. User authentication is provided by a personal identification number which is stored on the card. The personal identification number is generated by enciphering the serial number using a password as the key. The same card can be used to store a plurality of card issuer records, each including its own digital signature, and with user authentication for all records provided by a single personal identification number.

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McGraw-Hill Encyclopedia of Science and Technology, vol. 4, 1987, New York pp. 554-562.

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