Information processing device, information processing method...

H - Electricity – 04 – L

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H04L 9/00 (2006.01) G06F 12/14 (2006.01) G06F 21/00 (2006.01) G11B 20/00 (2006.01) G11B 20/10 (2006.01) H04L 9/08 (2006.01) H04L 9/32 (2006.01)

Patent

CA 2396481

Information processing system and method for detecting a revoke entity by using an effecting key block (EKB). On the basis of the effective key block (EKB) used in a key distribution construction of a tree structure, a device or service provider is judged as a revoke (reject) entity. In a public key certificate, an ID for identifying the position of a hierarchical key distribution tree is stored, and a tracing is executed using a tag of the effective key block (EKB) on the basis of the ID acquired from the public key certificate, to judge whether or not the ID is at the position where an EKB processing (decoding) is possible and thereby to judge whether or not the entity corresponding to the ID is revoked.

Cette invention se rapporte à un système et à un procédé de traitement d'informations, qui servent à détecter une entité de révocation en utilisant un bloc de clés effectives (EKB). Sur la base du bloc de clés effectives (EKB) utilisé dans une structure de distribution de clés d'une arborescence, un dispositif ou un fournisseur de services est évalué comme entité de révocation (rejet). Dans un certificat de clé publique, un identificateur permettant d'identifier la position d'une arborescence de distribution de clé hiérarchique est mémorisé, et un suivi est exécuté à l'aide d'une étiquette du bloc de clés effectives (EKB) sur la base de l'identificateur acquis dans le certificat de clé publique, afin d'évaluer si l'identificateur se trouve dans la position où un traitement EKB (décodage) est possible et évaluer ainsi si l'entité correspondant à l'identificateur est révoquée.

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