Implicit certificate verification

H - Electricity – 04 – L

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Details

H04L 9/32 (2006.01) H04L 9/30 (2006.01)

Patent

CA 2669145

A method of computing a cryptographic key to be shared between a pair of correspondents communicating with one another through a cryptographic system is provided, where one of the correspondents receives a certificate of the other correspondents public key information to be combined with private key information of the one correspondent to generate the key. The method comprises the steps of computing the key by combining the public key information and the private key information and including in the computation a component corresponding to verification of the certificate, such that failure of the certificate to verify results in a key at the one correspondent that is different to the key computed at the other correspondent.

La présente invention se rapporte à un procédé de calcul d'une clé cryptographique destinée à être partagée entre une paire de correspondants qui communiquent l'un avec l'autre au travers d'un système cryptographique; l'un des correspondants recevant de l'autre correspondant un certificat relatif à des informations de clé publique qui doivent être combinées à des informations de clé privée du premier correspondant pour générer la clé. Le procédé consiste à calculer la clé en combinant les informations de clé publique et les informations de clé privée, et en incluant dans le calcul un élément correspondant à la vérification du certificat, de telle sorte qu'un défaut de vérification du certificat aboutit à ce qu'une clé détenue par l'un des correspondants est différente de la clé calculée détenue par l'autre correspondant.

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