ATTRIBUTE AUTHENTICATION SYSTEM, AND ANONYMIZING METHOD AND PROGRAM OF ATTRIBUTE INFORMATION IN ITS SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide an attribute authentication system which guarantees an anonymous property at authenticating an attribute, anonymizes without requiring a communication with a third party and confirms an abeyance even in the case of conducting an authentication of an anonymity. SOLUTION: A CA server 3 generates key information of a public key to which a publisher's signature is given as attribute information. The key information is transmitted to an SP server 2 by being transformed by a user terminal 1 which multiplies a generated random number by an attribute certificate comprised of the publish key and the publisher's signature. The SP server 2 conducts an abeyance confirmation request to an abeyance verification station when an authentication is processed, and verifies that a relation of the attribute certificate with a signature key is established as a formal signature and provides a required service when it does not become null and void. COPYRIGHT: (C)2008,JPO&INPIT