Method and apparatus for certifying services obtained using a portable carrier such as a memory card
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United States of America Patent
Stats
-
Apr 25, 1989
Grant Date -
N/A
app pub date -
Dec 30, 1986
filing date -
Dec 31, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and apparatus for certifying services obtained with the aid of a portable carrier such as a memory card. A portable carrier (2) such as a credit card is adapted to be connected to an apparatus (1) that calculates a visual record or certificate (C), composed of a result (R) and parameters (PI, PE) necessary for calculating the result. This result is calculated by processing circuits (T2) in the card (2) under the control of a program (P2) recorded in its memory (M2) and of a secret key (S). The result emitted after a service has been furnished can then be recalculated, to certify that the service has been furnished. r
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