| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a group signature system, or the like, capable of collectively executing revocation processings, even when the re are many revoked members. Ž<P>SOLUTION: The group signature system is constituted by mutual connection between a revocation information management device 10 and member devices 11 to 1m. The revocation information management device includes a first input/output part 21 for accepting input of public keys of a plurality of revoked members which are the object of revocation processing and a first operation part 24 that uses the public keys of the plurality of revoked members to calculate revocation information, and each member device includes a second input/output part 31 for accepting input of the calculated revocation information and a second operation part 33 for updating public keys of members on the basis of the calculated revocation information. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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