Chip card with data and programs protected against ageing
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United States of America Patent
Stats
-
Apr 29, 1997
Grant Date -
N/A
app pub date -
Dec 20, 1993
filing date -
Dec 31, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In chip cards comprising non-volatile electrically erasable and programmable memories, to avoid the risks due to an ageing of the EEPROM memories, there is provided a procedure for the automatic refreshing of the contents of certain zones of the memory. The refreshing can take place at predetermined time intervals or at the end of a predetermined number of uses or routinely, whenever the card is powered, when the refresh operation relates to only one part of a zone, the address of this part being obtained by means of a random generator.
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