Method and apparatus for encryption having a feedback register w

Details Method and apparatus for encryption having a feedback register w Method and apparatus for encryption having a feedback register w

1993-08-30

1994-11-15

Gregory, Bernarr E.

Cryptography

Cryptanalysis

380 46, 380 49, 380 50, 331 78, 364717, H04L 900, G06F 102

Patent

active

053655850

ABSTRACT:
A method and apparatus for generating a pseudo-random bit sequence is provided. A first input bit is determined as a function of bits stored in a shift register in accordance with a first feedback algorithm. In addition, a second input bit is determined as a function of bits stored in the shift register in accordance with a second feedback algorithm. Subsequently, a particular input bit to be provided to the shift register is deterministically selected from the group consisting of the first input bit and the second input bit such that a non-linear pseudo random sequence may be produced by the shift register. In addition, a communication unit which utilizes the pseudo-random bit sequence in encrypting a signal to be transmitted and decrypting a received signal is described.

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patent: 5239294 (1993-08-01), Flanders et al.
Beker, Henry and Piper Fred, Cipher Systems, The Protection of Comunications, Northwood Books, London, Published 1982, Chapter 5, "Linear Shift Registers", pp. 175-215.
Peterson, W. Wesley and Weldon, Jr., E. J., Error-Correcting Codes Second Edition, The MIT Press, Copyright 1972, "Appendix C", pp. 472-492.
Bardell, Paul H., "Analysis of Cellular Automata Used as Pseudorandom Pattern Generators", paper presented at 1990 International Test Conference, Paper 34.1, CH2910-6/0000/0762$01.00, IEEE.

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