Transistor integrated device, particularly usable for coding pur

Details Transistor integrated device, particularly usable for coding pur Transistor integrated device, particularly usable for coding pur

1980-12-01

1983-10-11

Cangialosi, Sal

Telegraphy

Systems

Printing

34082533, 357 45, 307468, 235441, H01K 100, G06K 1906

Patent

active

044094345

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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