| 摘要 |
PROBLEM TO BE SOLVED: To perform continuation of certificate validity verification processing and a normal certificate verification response by detecting an undetectable type of abnormality in a cryptographic device, and to normally perform the certificate verification response even when abnormality of the cryptographic device is detected during validity verification processing requested from a verifier.SOLUTION: A certificate verification server 11detects abnormality in a first cryptographic device 12in a first signature generation request to the first cryptographic device 12, selects a second cryptographic device 12on the basis of operation states of cryptographic devices 12and 12managed by the certificate verification server 11, performs a second signature generation request 80 to a second certificate verification server 11being connected with the second cryptographic device 12, receives a signature value from the second certificate verification server 11, generates a response including the received signature value, and responds to a terminal device. |
