Memory cards
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United States of America Patent
Stats
-
Mar 20, 1990
Issued Date -
N/A
app pub date -
Jul 17, 1989
filing date -
May 23, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A debit card of the type having an integrated circuit on a semiconductor chip embedded in a plastic card includes logic circuitry (10), a counter (2), a ROM (6) and an EEPROM (8) for storing the value of the counter between transactions. By providing two EEPROMs (8A, 8B) in parallel whose values are compared by a comparator (24), the security of the card is increased since operation of the card may be blocked if the two values are not the same, indicating that attempts have been made to fraudulently reprogram the card.
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