PARTIAL BLIND SIGNATURE METHOD AND SYSTEM HAVING TRACE FUNCTION

摘要

PROBLEM TO BE SOLVED: To extend blind signature (FBS) having a trace function to a partial blind signature (PBS) to more flexibly operate the FBS.;SOLUTION: The blind signature is extended to the partial blind signature including information Info input to both of a signature device and signature request device and having the trace function by uniquely generating a part of a fixed value used for issuance and verification procedures of the blind signature from the Info. In addition, a protocol is changed so that the Info is utilized for issuance and verification of a signature using the Info determined in advance as a constant instead of constituting a part of the fixed value using the Info.;COPYRIGHT: (C)2007,JPO&INPIT