Method to confirm memory cards secret cyphers
The method is applicable to microcircuit memory cards comprising a data processing member and a memory device for recording a secret code and data supplied to the card. It consists in determining, in the memory device, at least one fixed-size memory area for systematically writing (2) in this area a...
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| Format: | Patent |
| Sprache: | eng ; fre ; ger |
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| Zusammenfassung: | The method is applicable to microcircuit memory cards comprising a data processing member and a memory device for recording a secret code and data supplied to the card. It consists in determining, in the memory device, at least one fixed-size memory area for systematically writing (2) in this area at least one bit before each presentation of a secret code and in erasing (9) all of the bits written into the fixed-size area as soon as the data processing member notices (7) that the secret code presented corresponds to the secret code recorded in the card. |
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