Registers – Systems controlled by data bearing records – Credit or identification card systems
Patent
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.
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Diehl Eric
Hamon Joel
Leduc Michel
Hajec Donald
Laboratoire Europeen de Recherches Electroniques Avancees, Socie
Sikorski Edward H.
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