Patent ID: 9628281
Date: 2017-04-18
CPC Classifications: G06F,H04L

Claim:
1. A long-term signature verification server comprising: long-term signature data reception means for receiving long-term signature data configured using signing target data, verification information for verifying the signing target data, and long-term verification information for verifying the authenticity of original data from a verifier terminal, the long-term verification information including long-term verification information for verifying the signing target data and the verification information for a predetermined period of time; long-term verification information forming information transmission means for forming long-term verification information forming information by extracting predetermined information included in the long-term signature data and for transmitting the long-term verification information forming information which has been formed to the verifier terminal; long-term verification information forming function value receiving means for receiving from the verifier terminal a long-term verification information forming function value calculated using a predetermined function by adding the original data to the transmitted long-term verification information forming information; and long-term verification information verification means for verifying the long-term verification information using the received long-term verification information forming function value; wherein the verification information for verifying the signing target data includes a group of certificates configured by a public key certificate of a private key that is contained in the verifier terminal along with the original data; and wherein the long-term signature server forms and verifies the long-term verification information while the original data and the private key are held in the verifier terminal.