Transistor integrated circuit protected against the analysis, an

Details Transistor integrated circuit protected against the analysis, an Transistor integrated circuit protected against the analysis, an

1980-12-01

1984-02-28

Rubinson, G. Z.

Registers

Transfer mechanism

Traveling pawl

235187, 235380, 357 84, 34082533, G06K 706

Patent

active

044343612

ABSTRACT:
A transistor integrated circuit particularly for use in transaction cards such as credit cards or payment cards comprises conductive film zones on the surface of the circuit having a shape and layout which makes it difficult or impossible to determine the layout of the circuit. Additional metal zones may be formed at the level or below the level of the transistor connection strips, which cannot be eliminated without eliminating the strips. Alternatively, instead of strips, metal zones extended in two dimensions are used whereby their junction to an underlying transistor may not be easily located by observing their surface by microscopic means.

REFERENCES:
patent: 3518494 (1970-06-01), James
patent: 3868057 (1975-02-01), Chavez
patent: 4067099 (1978-01-01), Ito et al.
patent: 4221240 (1978-10-01), Katto

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