METHOD FOR PROTECTING AGAINST THE UNAUTHORIZED INHIBITION OF WRITING OF CERTAIN MEMORY ZONES OF A MICROPROCESSOR CARD, AND DEVICE FOR IMPLEMENTING SAME.

摘要

To prevent a hacker from avoiding the invalidation of a microprocessor card in a pay television network, for example at the end of the period of validity of this card, it is checked that the card reader is still able to write to the memory of this card. This verification consists in monitoring the presence of the write voltage of the card.