Incorporating shared randomness into distributed cryptography

H - Electricity – 04 – L

Patent

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H04L 9/32 (2006.01)

Patent

CA 2347007

A method of distributed cryptography for high consequence security systems which employs randomness between operating parties. Shared randomness is accomplished by sharing cryptographic keys stored in secure hardware tokens by potentially less secure software or general purpose computing units that perform distributed cryptography. The shared randomness is based on shared keys (at the tokens) and unique context. Shared random values are incorporated into the computation of partial results used in the distributed cryptographic calculation. The incorporation of shared randomness provides a hand-shake among the hardware tokens. When the operation is successful, a result is computed with assurance that the correct parties have taken part in forming the result. The hand-shake assures binding of operating parties and added system security.

L'invention concerne un procédé de cryptographie répartie adaptée à des systèmes de sécurité à haute conséquence mettant à profit l'irrégularité répartie entre les parties opérationnelles. La répartition de l'irrégularité s'effectue par le partage de clés cryptographiques mémorisées dans des jetons matériels sûrs à charge de logiciels potentiellement moins sûrs ou d'unités informatisées générales effectuant la cryptographie répartie. Cette irrégularité répartie est fonction des clés distribuées (au niveau des jetons) et d'un contexte spécifique. Les valeurs aléatoires réparties sont insérées dans le calcul des résultats partiels utilisés dans le calcul cryptographique réparti. L'insertion d'une irrégularité répartie fournit un protocole de transfert pour les jetons matériels. Lorsque l'opération est réussie, le résultat est calculé avec la garantie que les parties correctes ont participé à la formation du résultat. Le protocole de transfert assure une liaison des parties opérationnelles et une sécurité du système améliorée.

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