Firmware encryption for microprocessor/microcomputer

Details Firmware encryption for microprocessor/microcomputer Firmware encryption for microprocessor/microcomputer

1993-08-05

1995-01-31

Cain, David C.

Cryptography

Cryptanalysis

380 4, 380 23, 380 25, G11B 2328, H04L 900

Patent

active

053864697

ABSTRACT:
A mask value generator is used to produce a mask value for deencrypting encrypted instructions from a memory. This encryption mask generator can produce a encryption mask value from a seed value and a program counter value. The seed value can stored in a memory outside the core microprocessor. The encryption mask value can be used to deencrypt instructions in an "exclusive or" logic section.

REFERENCES:
patent: 4797928 (1989-01-01), Dykes
patent: 4905277 (1990-02-01), Nakamura

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