Crypto microprocessor using block cipher

Details Crypto microprocessor using block cipher Crypto microprocessor using block cipher

1980-01-17

1982-03-09

Buczinski, S. C.

Telegraphy

Systems

Printing

178 2205, H04L 900

Patent

active

043190790

ABSTRACT:
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.

REFERENCES:
patent: 3798605 (1974-03-01), Feistel
patent: 3958081 (1976-05-01), Ehrsam et al.
patent: 4074066 (1978-02-01), Ehrsam et al.
patent: 4157454 (1979-06-01), Becker
patent: 4218738 (1980-08-01), Matyas et al.
patent: 4246638 (1981-01-01), Thomas

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