Cryptography private key storage and recovery method and...

H - Electricity – 04 – L

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H04L 9/30 (2006.01) G06F 7/72 (2006.01)

Patent

CA 2417520

Disclosed herein is a system and method for storage and recovery of a private key in a cryptographic system by providing a parameterization of the private key that uses less storage space than the full CRT parameter set {p, q, dp, dq, v} and that provides better computational efficiency than the minimal parameter se {p, q}. Also disclosed is a system and method for storage and recovery of a private key in a cryptographic system by providing a parameterization of the private key that uses less storage space than the full non-CRT parameter set {n, d} and that provides better computational efficiency than the minimal parameter set {p, q}. Furthermore, disclosed herein is a means for computing the parameters dp, dq, and d in a manner such that the computational sequence is independent of the values of the prime factors p and q, thereby reducing vulnerability to attacks that exploit such dependence.

L'invention concerne un système et un procédé de stockage et de récupération d'une clé privée dans un système cryptographique consistant à prévoir un paramétrage de la clé privée utilisant moins d'espace mémoire que tout l'ensemble des paramètres du théorème chinois des restes CRT {p, q, d¿p?, d¿q?, v} et procurant un meilleur rendement de calcul que l'ensemble de paramètres minimal {p, q}. L'invention concerne également un système et un procédé de stockage et de récupération d'une clé privée dans un système cryptographique consistant à prévoir un paramétrage de la clé privée utilisant moins d'espace mémoire que tout l'ensemble de paramètres non CRT {n, d} et offrant un meilleur rendement de calcul que l'ensemble de paramètres minimal {p, q}. De plus, l'invention concerne un moyen de calcul des paramètres d¿p?, d¿q? et d d'une manière telle que la séquence de calcul est indépendante des valeurs des facteurs premiers p et q, réduisant ainsi la vulnérabilité aux attaques exploitant une telle dépendance.

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