Method and apparatus for encryption having a feedback...

H - Electricity – 04 – L

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H04L 9/06 (2006.01) H03K 3/84 (2006.01) H04L 9/26 (2006.01) H04J 11/00 (2006.01)

Patent

CA 2146439

A method and apparatus for generating a pseudo-random bit sequence is provided. A first input bit (260) is determined as a function of bits stored in a shift register (252) in accordance with a first feedback algorithm. In addition, a second input bit (262) is determined as a function of bits stored in the shift register (252) in accordance with a second feedback algorithm. Subsequently, a particular input bit (268) to be provided to the shift register (252) is deterministically selected from the group consisting of the first input bit (260) and the second input bit (262) such that a non-linear pseudo random sequence may be produced by the shift register (252). 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.

Méthode et appareil de production d'une séquence de bits pseudo-aléatoire. Un premier bit d'entrée (260) est déterminé en fonction de bits stockés dans un registre à décalage (252) conformément à un premier algorithme de rétroaction. De plus, un deuxième bit d'entrée (262) est déterminé en fonction de bits stockés dans le registre à décalage (252) conformément à un deuxième algorithme de rétroaction. Par la suite, un bit d'entrée particulier (268) à transmettre au registre à décalage (252) est sélectionné de manière déterministe parmi le groupe réunissant le premier bit d'entrée (260) et le deuxième bit d'entrée (262) de façon à permettre au registre à décalage (252) de produire une séquence pseudo-aléatoire non linéaire. En outre, une unité de communication utilisant la séquence de bits pseudo-aléatoire pour chiffrer un signal à transmettre et déchiffrer un signal reçu est présentée.

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