Group signature system, method, device, and program

H - Electricity – 04 – L

Patent

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Details

H04L 9/32 (2006.01) G09C 1/00 (2006.01)

Patent

CA 2554368

A signature device (2) encrypts a first element of a member certificate by using a first random number and public information disclosed by a group management device (1) so as to generate encrypted data. Moreover, the signature device (2) converts the first element by using a random number and the public information so as to create first and second converted data. Moreover, the signature device (2) creates knowledge signature data from which the first element, the second element, and the information on the signature key will not be known and outputs a group signature including it together with a message. A verification device (3) verifies whether the group signature has been created by using a member certificate and a signature key of a member registered in the group.

L'invention porte sur un système de signature de groupe (2) codant un premier élément d'un certificat membre au moyen d'un premier nombre aléatoire et sur des informations publiques divulguées par un gestionnaire de groupe (1) de façon à générer des données codées. De plus, le dispositif de signature (2) convertit le premier élément en utilisant un nombre aléatoire et les informations publiques de façon à produire des premières et secondes données converties. Le dispositif de signature (2) crée également des données de signature à base de connaissances à partir desquelles les premier et second éléments et les informations sur la clé de signature ne seront pas connus et génère une signature de groupe incluse dans un message. Un dispositif de vérification (3) vérifie si le groupe de signature a été créé au moyen d'un certificat de membre et si une clé de signature d'un membre est enregistrée dans le groupe.

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