Data ciphering device

Details Data ciphering device Data ciphering device

1994-12-27

1997-03-04

Cain, David C.

Cryptography

Electric signal modification

Having production of printed copy

380 28, 380 49, H04L 900

Patent

active

056088027

ABSTRACT:
A data ciphering device that has special application in implementing the Digital European Cordless Telephone (DECT) standard data ciphering algorithm which requires a lengthy procedure of key loading and logic operations during the stages of pre-ciphering and ciphering which require clocks operating at different frequencies. The device performs parallel mode loading of the shift registers, with a ciphering keyword. It also calculates, in a first cycle, during the pre-ciphering, the values of the bits of each shift register that determine the value of the next shift in order to, in a second cycle, effect parallel mode shifting in these registers with a value equal to the sum of the two previous shift values. During the ciphering process, the shifting is done in the registers, in parallel mode and in a single data clock cycle, with a value equivalent to the serial value obtained by the algorithm.

REFERENCES:
patent: 4188506 (1980-02-01), Schmid et al.

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