Registers – Records
Patent
1978-08-25
1980-07-08
Cook, Daryl W.
Registers
Records
235488, G06K 1906
Patent
active
042119197
ABSTRACT:
A portable data or information carrier in the form of a card or the like. In order to maximize the confidentiality of information stored in the carrier, and more specifically to limit the amount of information available to a would-be defrauder monitoring data lines connecting the data carrier to external devices, the data carrier includes a microprocessor and a memory operatively associated with the microprocessor. The memory has three particular zones, namely: (1) a secret zone in which reading and writing operations only by internal circuits of the data carrier are permitted; (2) a working zone in which any reading or writing operations are permitted; and (3) a read zone where only reading operations are permitted. The secret zone of the memory includes at least one key or code which is compared to a key received from a device external to the data carrier to determine whether a particular operation is authorized. To ensure that the data carrier consumes the same amount of current whether the requested operation is authorized or unauthorized, a bit is stored in the memory in either event. In general, the internal handling of data by the data carrier deprives a would-be defrauder of any opportunity to learn the nature of information required to use the data carrier.
REFERENCES:
patent: 3702464 (1972-11-01), Castrucci
patent: 3868057 (1975-02-01), Chavez
patent: 3876865 (1975-04-01), Bliss
patent: 3894756 (1975-07-01), Ward
patent: 3919447 (1975-11-01), Kilmer, Jr. et al.
patent: 4001550 (1977-01-01), Schatz
patent: 4004133 (1977-01-01), Hannon et al.
patent: 4007355 (1977-02-01), Moreno
patent: 4092524 (1978-05-01), Moreno
patent: 4105156 (1978-08-01), Dethloff
Compagnie Internationale pour l'Informatique
Cook Daryl W.
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