IC memory card system for authenticating an IC memory card, and

Details IC memory card system for authenticating an IC memory card, and IC memory card system for authenticating an IC memory card, and

1998-11-18

2000-10-03

Lee, Michael G

Registers

Systems controlled by data bearing records

Credit or identification card systems

235380, 235492, G06K 500

Patent

active

061260711

ABSTRACT:
An IC memory card and an IC memory card system prevent the use of unauthorized or illegal copies or forgeries of IC memory cards storing original content. Using a key value selected by a terminal device of the IC memory card system, the terminal device calculates a first value and the IC memory card separately calculates a third value by applying a particular method to the key value. Second and fourth values are similarly calculated using a different particular method. The IC memory card then determines whether the first and third values are the same. The terminal device separately determines whether the second and fourth values are the same. Only if the first and third values are confirmed to match, and then the second and fourth values are also confirmed to match, does the terminal device recognize the IC memory card as an authentic IC memory card and not an unauthorized or illegal copy or forgery.

REFERENCES:
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patent: 5046094 (1991-09-01), Kawamura et al.
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patent: 5288978 (1994-02-01), Iijima
patent: 5293029 (1994-03-01), Iijima
patent: 5396558 (1995-03-01), Ishiguro et al.
patent: 5446796 (1995-08-01), Ishiguro et al.
patent: 5799085 (1998-08-01), Shona
patent: 5914471 (1998-08-01), Van De Pavert

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