SIGNATURE RELIABILITY VERIFICATION METHOD, SIGNATURE RELIABILITY VERIFICATION PROGRAM, AND DATA COMMUNICATION SYSTEM

摘要

In an ordering side terminal (10), a slip creation section (11) creates slip data (21) and a verification method specification section (12) specifies a verification method of reliability, so that verification method data (22) is created. A signature creation section (13) creates a signature (23) from the slip data (21) and the verification data (22) and a certificate acquisition section (14) acquires a certificate (24). The slip data (21), the verification method data (22), the signature (23), and the certificate (24) are transmitted as ordering data (20). In an order reception side terminal (30), a signature verification section (31) verifies the signature (23), a verification method check section (33) checks validity of the verification method indicated by the verification method data (22), and a verification section (34) verifies reliability of the certificate (24).