Tamper proof security measure in data writing to non-volatile memory
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United States of America Patent
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Feb 3, 1998
Grant Date -
N/A
app pub date -
Feb 3, 1995
filing date -
Apr 13, 1993
priority date (Note) -
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Abstract
A method of writing data to non-volatile memory such as electrically erasable programmable read only memory (EEPROM) in a smart card provides a write status region of EEPROM which is examined on each reset of the card. If the preceding write operation was unsuccessful, perhaps because of deliberate manipulation of the card, a recovery procedure is implemented. If recovery is successful, the card operation can be run. Otherwise the card is unusable.
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