Digital computer having code conversion apparatus for an encrypted program
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United States of America Patent
Stats
-
Dec 15, 1981
Grant Date -
N/A
app pub date -
Feb 4, 1980
filing date -
Feb 4, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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