TIME CERTIFICATION METHOD, TIME CERTIFICATION AUDIT METHOD, TIME CERTIFICATION DEVICE, AUDIT DEVICE, TIME CERTIFICATION PROGRAM, TIME CERTIFICATION AUDIT PROGRAM, TIME CERTIFICATION VERIFICATION PROGRAM, AND PROGRAM RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To simply verify an acceptance certification with a user's device, and at the same time, verify the acceptance certification without using public information periodically published to media, etc., and verify the trueness of time given to the acceptance certification.;SOLUTION: A time stamp system 100 comprises a time certification device 1, a time information offering device 2 which offers time information used for the creation of the time stamp, a plurality of client devices 3i, an audit device 5 which performs the audit of the acceptance certification issued by the time certification device 1, and a computer network 4 which mutually connect the respective devices. The time certification device 1 replies the acceptance certification to the client device 3i responding to the time certification request from the client device 3i, and at the same time, if doubt arises in the acceptance certification, the client device 3i can verify the acceptance certification by the information published to media, etc. 40 by the time certification device 1, or the audit result by the audit device 5.;COPYRIGHT: (C)2005,JPO&NCIPI