Block substitution based encryption by a modulo 2 addition metho

Details Block substitution based encryption by a modulo 2 addition metho Block substitution based encryption by a modulo 2 addition metho

1989-10-04

1991-08-06

Tarcza, Thomas H.

Cryptography

Communication system using cryptography

Time segment interchange

380 28, 380 49, H04K 104

Patent

active

050383760

ABSTRACT:
Methods and apparatus for modulo 2 addition based encryption by block substitution techniques which allows use of the substitution scheme with relatively simple hardware. The block substitution, a one to one mapping of n bit binary numbers onto themselves, is based on the fact that certain permutations of the n bit binary numbers define a block substitution by modulo 2 addition of one permuted set of numbers to another, and that a subset of these define equations having an additive relationship when viewed as vectors. This allows the simple changing of the transformation on a frequent basis. Various properties of the transformations and methods of using the same are disclosed.

REFERENCES:
patent: 4322577 (1982-03-01), Brardstrom
patent: 4685132 (1987-08-01), Bishop et al.
patent: 4797921 (1989-01-01), Shiraishi
patent: 4932056 (1990-06-01), Shamir

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