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US 4,734,569 AGranted
IC card
AssigneeCasio Computer Co., Ltd.
InventorsShigeyuki Kawana, Harumi Nakano
Life of this patent
Estimating the term…
Abstract
When identification data stored in a predetermined area of a data memory in an IC card and data supplied from a card terminal coincide, the data stored in the data memory is substantially erased.
Claims8
An IC card comprising:
- memory means having at least one memory area for storing secret data therein;
- means for reading out data stored in said memory means;
- first comparator means for checking whether externally supplied data and data read out by said reading means are coincident;
- and
- means for substantially erasing said secret data stored in said memory means when the coincidence of data compared in said first comparator means is detected.
2 more elements
Dependencies are inferred from the claim text.