Protection against the non-authorized inhibition of writing in c

Details Protection against the non-authorized inhibition of writing in c Protection against the non-authorized inhibition of writing in c

1993-07-26

1995-07-18

Hajec, Donald

Registers

Systems controlled by data bearing records

Credit or identification card systems

371 62, 235438, 235492, G06F 1130

Patent

active

054343976

ABSTRACT:
To counter illicit prevention of the invalidation of a smart card in a pay television network, for example when the period of validity for the card has expired, a verification of the card reader's ability to write to the card's memory is made. This verification consists in periodically sending a data item to be stored in the card. A counter on the card is reset by the writing voltage of the card's storage. In the event the writing voltage does not reach the counter, the counter's overflow output is connected to a read inhibition circuit which blocks functions of the card.

REFERENCES:
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patent: 4627060 (1986-12-01), Huang et al.
patent: 4689766 (1987-08-01), Kent
patent: 4760575 (1988-07-01), Watanabe
patent: 4780602 (1988-10-01), Kawana et al.
patent: 4803351 (1989-02-01), Shigenaga
patent: 4816653 (1989-03-01), Anderl et al.
patent: 4816654 (1989-03-01), Anderl et al.
patent: 5054023 (1991-10-01), Kronberg
patent: 5175840 (1992-12-01), Sawase et al.

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