04319079 is referenced by 287 patents and cites 6 patents.

A cryptographic microprocessor for processing data and executing programs which are stored in enciphered blocks to prevent unauthorized alteration and copying. Such a "crypto-microprocessor" deciphers the enciphered program and data blocks piecemeal as execution of the deciphered program proceeds. A product block cipher circuit makes each bit of a deciphered block a complicated function of each bit of an enciphered block, and each bit of an encryption key, and each bit of the digital address of the enciphered block. Combined use of block and byte deciphering is described. If a block of the enciphered program is altered, the crypto-microprocessor temporarily or permanently disables itself.

Title
Crypto microprocessor using block cipher
Application Number
75120
Publication Number
4319079
Application Date
January 17, 1980
Publication Date
March 9, 1982
Inventor
Robert M Best
16016 - 9th Ave. NE., Seattle, 98155
WA, US
Agent
Seed Berry Vernon & Baynham
IPC
H04L 9/00
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