公开(公告)号：US09628281B2

公开(公告)日：2017-04-18

申请号：US14340437

申请日：2014-07-24

Applicant: SEIKO INSTRUMENTS INC.

Inventor： Shinichi Murao ,  Masakazu Uehata ,  Koichi Shibata

IPC: G06F15/16 ,  H04L9/32 ,  G06F21/64

CPC classification number: H04L9/3247 ,  G06F21/64 ,  H04L9/3236 ,  H04L9/3263 ,  H04L9/3268 ,  H04L9/3297 ,  H04L2209/68

Abstract: A long-term signature verification server receives 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 server verifies the signing target data and the verification information for a predetermined period of time, forms long-term verification information forming information by extracting predetermined information included in the long-term signature data, and transmits the long-term verification information forming information to the verifier terminal. The server receives 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 verifies the long-term verification information using the received long-term verification information forming function value.