Microprocessor for executing enciphered programs

Details Microprocessor for executing enciphered programs Microprocessor for executing enciphered programs

1977-10-31

1979-09-18

Buczinski, S. C.

Telegraphy

Systems

Printing

364200, 364900, H04L 900

Patent

active

041683960

ABSTRACT:
A microprocessor for executing computer programs which have been enciphered during manufacture to deter the execution of the programs in unauthorized computers. This microprocessor deciphers and executes an enciphered program one instruction at a time, through a combination of substitutions, transpositions, and exclusive-OR additions, in which the address of each instruction is combined with the instruction. Each unit may use a unique set of substitutions so that a program that can be executed in one microprocessor can not be run in any other microprocessor.

REFERENCES:
patent: 3504132 (1970-03-01), Wallace, Jr.
patent: 3798359 (1974-03-01), Feistel
patent: 3911216 (1975-10-01), Bartek et al.
patent: 3944976 (1976-03-01), France
patent: 3958081 (1976-05-01), Ehrsam et al.
patent: 4037215 (1977-07-01), Birney et al.
patent: 4074066 (1978-02-01), Ehrsam et al.
patent: 4120030 (1978-10-01), Johnstone
Motorola DES 3100NSM Network Security Module Preview (Brochure), Feb. 16, 1979.
Hard-Node (Brochure), Complan, Computation Planning, Inc., Mar. 28, 1977.

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