Improved cryptographically secure pseudo-random bit...

H - Electricity – 04 – L

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H04L 9/28 (2006.01) G06F 7/58 (2006.01) H04L 9/22 (2006.01)

Patent

CA 2262551

The cryptographically secure pseudo-random bit generator (100) includes a front-end generator (102), a selector (104), a random function processor (106), a graph processor (108), and a bit-wise exclusive-or circuit (110). This cryptographically secure pseudo-random bit generator (100) stretches bit strings by the use of certain one-way functions acting on the bit strings. In addition, bit strings are generated from other input bit strings using expander graphs. The stretched bit strings and the bit strings from the expander graphs are combined in the bit-wise exclusive-or circuit.

Le générateur (100) de nombres binaires pseudo-aléatoires cryptographiquement surs de la présente invention comporte un générateur frontal (102), un sélecteur (104), un organe de traitement de fonctions aléatoires (106), un processeur de graphe (108) et un circuit (110) "ou" exclusif opérant au niveau du bit. Ledit générateur (100) de nombres binaires pseudo-aléatoires cryptographiquement surs "étire" des chaînes de bits en exécutant certaines fonctions unidirectionnelles sur lesdites chaînes de bits. Des chaînes de bits sont en outre générées à partir d'autres chaînes de bits en entrée au moyen de graphes d'expansion. Les chaînes de bits étirées et les chaînes de bits issues des graphes d'expansion sont combinées dans le circuit "OU" exclusif opérant au niveau du bit.

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