Digital computer having code conversion apparatus for an...

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

G - Physics

06

F

354/230.72

G06F 9/22 (2006.01) G06F 21/00 (2006.01) G06F 1/00 (2006.01)

Patent

CA 1154876

LUMLEY-8 - 15 - DIGITAL COMPUTER ABSTRACT OF THE DISCLOSURE The architecture of a conventional digital computer, for example, a microprocessor, is modified by interposing a multiplexer, a logic array and a demultiplexer between the instruction register and instruction decoder. 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.

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