Digital computer having code conversion apparatus for an encrypt

Details Digital computer having code conversion apparatus for an encrypt Digital computer having code conversion apparatus for an encrypt

1980-02-04

1981-12-15

Zache, Raulfe B.

Boots, shoes, and leggings

G06F 500

Patent

active

043062890

ABSTRACT:
The architecture of a conventional digital computer, for example, a microprocessor, is modified by interposing a multiplexer (31), a logic array (32) and a demultiplexer (33) between the instruction register (17) and instruction decoder (18). The logic array "scrambles" the bits in each instruction code; however, if the program to be run is priorly encrypted with this "scrambling" in mind, it will run normally. On the other hand, if the encrypted program is copied, the copied program will not run on an unmodified computer.

REFERENCES:
patent: 3846763 (1974-11-01), Riikonen
patent: 3889242 (1975-06-01), Malmer, Jr.
patent: 4042972 (1977-08-01), Gruner et al.
patent: 4064554 (1977-12-01), Tubbs
patent: 4120030 (1978-10-01), Johnstone
patent: 4168396 (1979-09-01), Best

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