Secret information preserving system for a multiple issuer IC ca

Details Secret information preserving system for a multiple issuer IC ca Secret information preserving system for a multiple issuer IC ca

1988-03-17

1990-05-22

Trafton, David L.

Registers

Systems controlled by data bearing records

Credit or identification card systems

235492, G06K 500

Patent

active

049280015

ABSTRACT:
A system for maintaining the secrecy of information stored in a multiple issuer IC card, comprising an IC card which has its memory divided into a plurality of discrete portions, each of which may be accessed only by means of a predetermined different identification code, and a terminal which is used to write an identification code into a portion of the card memory only when it is supplied with an input code which corresponds with an issuer code which was previously stored in that portion of the memory.

REFERENCES:
patent: 4650975 (1987-03-01), Kitchener
patent: 4656342 (1987-04-01), Ugon
patent: 4683372 (1987-07-01), Matsumoto
patent: 4736094 (1988-04-01), Yoshida

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