Pseudo-random generator based on a hash coding function for...

Details Pseudo-random generator based on a hash coding function for... Pseudo-random generator based on a hash coding function for...

H - Electricity

04

L

H04L 9/32 (2006.01) G07F 7/10 (2006.01)

Patent

CA 2288767

The invention concerns a cryptographic system, normally requiring the drawing of a random number k, which is a whole number. The system is characterised in that it is operated by replacing said random number k by the value h (m/secret) in which h is a hash coding function, m is the message intervening in said system and "secret" is a secret unknown to the world outside the cryptographic system. The invention is particularly applicable to communicating media such as smart cards, PCMCIA cards, badges, contactless cards or any other portable medium.

La présente invention concerne un système cryptographique, nécessitant normalement le tirage d'un aléa k, l'aléa étant un entier, caractérisé en ce qu'il est mis en oeuvre en remplaçant ledit aléa k par la quantité h(m/secret) où h est une fonction de hachage, m est le message intervenant dans ledit système et "secret" est un secret inconnu du monde extérieur au système cryptographique. Elle est particulièrement destinée à s'appliquer dans des appareils communiquants qui sont des cartes à puce, des cartes PCMCIA, des badges, des cartes sans contact ou tout autre appareil portable.

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