Program execution apparatus for ensuring security of a program

Details Program execution apparatus for ensuring security of a program Program execution apparatus for ensuring security of a program

1991-03-27

1993-05-25

Gregory, Bernarr E.

Cryptography

Cryptanalysis

380 23, 380 24, 380 25, 380 49, 380 50, 235379, 235380, H04L 900

Patent

active

052146979

ABSTRACT:
A micro controller which has a first memory in which invertedly enciphered program data is stored, a second memory which stores cipher key data necessary for decoding the password stored in the first memory, a CPU which controls writing data to or reading data from the first and second memories and a unit which descrambles the cipher in the program data stored in the first memory based on the key data stored in the second memory, when the CPU accesses the first memory. The operation of this CPU is based on the program data which is decoded using the descrambling unit, which makes it possible to effectively block decoding or altering of programs and data.

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