Method of ratifying secret codes for memory cards

Details Method of ratifying secret codes for memory cards Method of ratifying secret codes for memory cards

1991-10-16

1994-03-22

Sikes, William L.

Registers

Systems controlled by data bearing records

Credit or identification card systems

283 74, G06K 500, B42D 1500

Patent

active

052966879

ABSTRACT:
A method of ratifying secret codes for IC memory cards including a data processing member and a storage device for recording a secret code and data delivered to the card. It consists in determining at least one fixed-size memory zone in the storage device or systematically writing at least one bit in said zone prior to each presentation of a secret code, and in erasing all of the bits recorded in the fixed-size zone once the data processor member observes that the presented secret code corresponds to the secret code recorded in the card.

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