Method of rotating a word constituted by binary elements and arr

Details Method of rotating a word constituted by binary elements and arr Method of rotating a word constituted by binary elements and arr

1990-07-24

1992-12-01

Tarcza, Thomas H.

Cryptography

Electric signal modification

Having production of printed copy

H04L 900

Patent

active

051685230

ABSTRACT:
A method of rotating a word constituted by binary elements b.sub.0 to b.sub.p-1 arranged from a position P(i) to a position P(i+p-1) in a global format containing p+n binary elements arranged according to the positions P(1) to P(p+n), which global format is contained in one or more registers (K0-K7) as elementary formats is performed by a microprocessor (8) for carrying out instructions with respect to the elementary formats of clockwise rotation, counterclockwise rotation and an instruction of transfer of a binary element to a carry register (c), which instructions are stored in a read-only memory.

REFERENCES:
IBM Technical Disclosure Bulletin, vol. 29, No. 12, May 1987, pp. 5594-5595, "Software Data Encryption Standard".

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