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

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

H - Electricity

04

K

340/70

H04K 1/00 (2006.01) H04L 9/18 (2006.01)

Patent

CA 1181830

Abstract of the Disclosure: 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.

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