The system and method in order to form the certification possible time stamp which for the electronic filing document is relied on

摘要

(57) Abstract The time infrastructure system which is relied on, offers time stamp to the electronic filing document from the local source. The system, the master clock 204 which is relied on, the local clock 206 which is relied on, includes network operation center 210. The master clock and the network operation center which are relied on are arranged in the safe environment which is managed by the third party who is relied on. The local clock which is relied on is a possibility of being arranged in the environment which is not safe. As for the master clock which is relied on, same period with the time standard where domestic time server 202 and the like is recognized is recognized. Issues time stamp as for the local clock which is relied on, same period with the master clock which is relied on is recognized. Time stamp and recognition, using open key cryptography, sign by the device which issues, certification after becomes possible. Network operation center the log records clock recognition, responds to the demand for certification of time stamp.