Device for encrypting each input data bit by at least one keying

Details Device for encrypting each input data bit by at least one keying Device for encrypting each input data bit by at least one keying

1981-10-02

1984-05-08

Cangialosi, Sal

Telegraphy

Systems

Printing

178 2213, 178 2216, H04L 900

Patent

active

044476728

ABSTRACT:
An encrypting device for an input data bit sequence comprises a shift register for producing a bit pattern represented by successive encrypted bits for the data bits preceding a current bit. A bit pattern converter selects in compliance with the bit pattern a bit of a code pattern preset therein. A keying bit may be provided by the selected bit, to which the current bit is added modulo two to produce a new encrypted bit. For more excellent encryption, the successively selected bits may be used to produce an additional bit pattern, responsive to which either the keying bit or an additional keying bit, to be also added to the current bit, may be provided by a selected bit of another code pattern. Each bit pattern converter may be preset with a plurality of code patterns. One or more encrypting devices may be used in encrypting a sequence of input data digits, each comprising a plurality of input data bits among which at least one bit may be a dummy bit. A decrypting device should have a structure corresponding to the counterpart encrypting device.

REFERENCES:
patent: Re30957 (1982-06-01), Feistel
patent: 3639690 (1972-02-01), Braun et al.
patent: 3678198 (1972-07-01), Ehrat
patent: 3784743 (1974-01-01), Schroeder
patent: 3796830 (1974-05-01), Smith
patent: 3920894 (1975-11-01), Shirley et al.
patent: 4157454 (1979-06-01), Becker
patent: 4172213 (1979-10-01), Burnes et al.
patent: 4187392 (1980-02-01), Safford
patent: 4211891 (1980-06-01), Glitz
patent: 4304962 (1981-12-01), Fracassi et al.

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