METHOD FOR AUTOMATICALLY ACQUIRING ELECTRONIC FILE TIME AUTHENTICATION, AND COMMUNICATION TERMINAL HAVING FUNCTION OF AUTOMATICALLY ACQUIRING ELECTRONIC FILE TIME AUTHENTICATION

摘要

A method for automatically acquiring electronic file time authentication comprising a step of creating a Hash value list by listing Hash values calculated by applying a predetermined Hash function to a plurality of electronic files and a step of transmitting the Hash value list thus created or the Hash value of the electronic data to a time authentication authority through a communication network and storing time stamp token information received from the time authentication authority.