Securing a pseudo-random generator

Details Securing a pseudo-random generator Securing a pseudo-random generator

G - Physics

06

F

G06F 7/58 (2006.01)

Patent

CA 2466658

The invention concerns a method for making secure a generator (1) generating pseudo-random numbers (5). The generator (1) is characterized by its internal state. The generator (1) comprises: a first storage zone (2) containing state bits (3), representing the internal state of said generator (1); a computing unit (4) performing arithmetic operations on said state bits (3) to produce said pseudo-random numbers (5) and modify the state bits (3); a second storage zone (6) containing said pseudo-random numbers (5); a single output (7) for reading said pseudo-random numbers (5) contained in said second storage zone (6). The inventive method includes the step which consists in irreversibly and unconditionally inhibiting, in particular through logical and/or mechanical and/or electronic means, reading and writing of said state bits (3) from outside said generator (1), including via said single output (7).

L'invention concerne un procédé sécuriser un générateur (1) générant des nombres pseudo-aléatoires (5). Le générateur (1) est caractérisé par son état interne. Le générateur (1) comprend: - une première zone mémoire (2) contenant des bits d'état (3), représentant l'état interne dudit générateur (1), - une unité de calcul (4) effectuant des opérations arithmétiques sur lesdits bits d'état (3) pour produire lesdits nombres pseudo-aléatoires (5) et modifier lesdits bits d'état (3), - une seconde zone mémoire (6) contenant lesdits nombres pseudo-aléatoires (5), - une sortie unique (7) permettant de lire lesdits nombres pseudo-aléatoires (5) contenus dans ladite seconde zone mémoire (6). Le procédé selon l'invention comprend l'étape d'inhiber de manière irréversible et inconditionnelle, notamment par des moyens logiques et/ou mécaniques et/ou électroniques, la lecture et l'écriture desdits bits d'état (3) depuis l'extérieur dudit générateur (1), y compris via ladite sortie unique (7).

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