Integrated circuit devices for secure data encryption

Details Integrated circuit devices for secure data encryption Integrated circuit devices for secure data encryption

1982-09-07

1985-11-26

Cangialosi, Salvatore

Telegraphy

Systems

Printing

178 2214, 178 2209, A04K 102

Patent

active

045555915

ABSTRACT:
The present invention relates to apparatus for placing digital words or a private key into a register in an integrated circuit in such a manner that it cannot be later read or modified from outside the integrated circuit for purposes of, for example, providing a secure communication system. More particularly, a special key register in the form of an externally programmable read-only-memory which is programmable from external to the integrated circuit is provided. The programmable register contains at least one extra bit which is not part of the private key for enabling the program line through a gating means and entering the private key into the appropriate locations in the register before a predetermined binary code is placed in the at least one extra bit location which disables the gating means and thereafter prevents the changing of the private key in the register.

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patent: 4092524 (1984-05-01), Moreno
patent: 4105156 (1978-08-01), Dethloff
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patent: 4333074 (1982-06-01), Sutherland et al.
patent: 4442345 (1984-08-01), Mollier et al.
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Motorola Semiconductor Data Sheet-AD1-827-R1 (1980) MC 6859 Data Security Device, pp. 1-10.

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