| 摘要 |
<p>A long-term signature system 1 can generate long-term signature data for each of a plurality of pieces of original data in cooperation with a long-term signature server 2 while retaining original data and a secret key for signature in a client terminal 3 without sending original data and the secret key to the outside. In the long-term signature system 1, there are PAdES and XAdES as a long-term signature scheme, a scheme is designated for each piece of original data, and in a state where the plurality of schemes are mixed, long-term signature data can be generated in parallel. In the long-term signature system 1, the secret key of a certificate authority issued a public key certificate paired with the secret key for signature is identical, and the secret key of a TSA certificate authority issued a public key certificate paired with a secret key for time stamp is also identical. Accordingly, verification information is common to original data, and it is only necessary to process single verification information. With the above, it is possible to perform a long-term signature on a plurality of pieces of original data while retaining confidential information on the user side.</p> |
