| 摘要 |
<p>In the present invention, on the basis of revocation information of a certificate, information of a certificate authority and of the certificate issued by the certificate authority from a terminal device, and information of a cryptographic algorithm, validity of the certificate from the terminal device is determined, whereupon if the certificate is valid, a verification result treating the certificate as valid is created, and using information of the cryptographic algorithm from the terminal device and information of the cryptographic algorithm used for the signature of the certificate authority which has been imparted to the revocation information of the certificate, a selection list of cryptographic algorithms to be used for the response signature to impart to the verification result of the certificate is created in order to determine the cryptographic algorithm used for the response signature to impart to the verification result of the certificate on the basis of the created list and the cryptographic algorithms capable of being accommodated by the verification server.</p> |
