Transistor integrated device, particularly usable for coding purposes
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 11, 1983
Grant Date -
N/A
app pub date -
Dec 1, 1980
filing date -
Nov 30, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a transaction card such as a credit or payment card provided with an integrated circuit for performing and recording the transaction, communications between the card and an access terminal must be coded so as to prevent fraud attempts. An integrated circuit coding device for coding or decoding a message in accordance with a confidential coding key comprises active transistors, and passive transistors, i.e. permanently blocked and/or permanently conductive, interconnected in such a way that observation of such circuit by means of an electronic microscope does not allow the determination of the confidential key which is implemented by the circuit.
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