Arrangement for transforming plaintext into ciphertext for use i

Details Arrangement for transforming plaintext into ciphertext for use i Arrangement for transforming plaintext into ciphertext for use i

1993-05-21

1994-04-05

Barron, Jr., Gilberto

Cryptography

Communication system using cryptography

Data stream/substitution enciphering

380 28, 380 50, H04K 102, H04L 918

Patent

active

053012356

ABSTRACT:
A hardware arrangement is provided for transforming plaintext into corresponding ciphertext. The plaintext includes a plurality of words each having a predetermined bit length. The hardware arrangement sequentially acquires the words and exhibits a predetermined number of arithmetic operations on the word acquired. Each of the arithmetic operations includes a plurality of arithmetic processes. The hardware arrangement outputs an enciphered word therefrom when completing the predetermined number of arithmetic operations. A selector is arranged to receive two inputs and selectively output one of the two inputs. One of the two inputs corresponds to the word acquired. A multiplier is coupled to receive the output of the selector. The multiplier multiplies the output of the selector by a multiplier and outputs a product therefrom. An adder is coupled to receive the product. The adder adds the product and an addend and then outputs a sum. A divider is coupled to receive the sum such as to divide the sum by a modulus and outputs a residue therefrom. The value of the modulus is subject to change at each of the arithmetic operations. The residue is applied to the selector as the other of the two inputs.

REFERENCES:
patent: 4134071 (1979-01-01), Ohnsorge
patent: 4375579 (1983-03-01), Davida et al.
patent: 4441095 (1984-04-01), Widmer et al.
patent: 4760600 (1988-07-01), Nakai
patent: 5008938 (1991-04-01), Freeburg et al.

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