| 摘要 |
PROBLEM TO BE SOLVED: To provide a system capable of confirming the effectiveness of a public key certificate corresponding to the request of a signature verifying system by CA access smaller than that in the conventional system while reliablity of the system does not depend on the managing policy of a CA, and a method therefor and medium on which its program is recorded. SOLUTION: When the effectiveness confirming and processing requests of a public key certificate is generated, whether the confirming of the effectiveness satisfying conditions in a confirmation condition storage part 31 is possible or not with respect to the certificate is confirmed from a status management table 32 by a status management table referring means 34 and when the confirming of the effectiveness of the certificate is possible, this system returns status information to the origin of the request and, besides, when it is impossible, the system requests the confirmation to a CA 20 by using a CA inquiry means 36 and the system registers the result of the confirmation and the data and hour when the status is confirmed in the management table 32 by a status management table registering means 35 and also the system returns status information to the origin of the request.
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