METHOD FOR PROGRAM AUTHENTICATION WITHOUT SECRET KEY, PROGRAM ID COMMUNICATION PROCESSING CONTROL METHOD, PROGRAM ID COMMUNICATION RANGE CONTROL METHOD, AND METHOD FOR PROVIDING COMMUNICATION LINE BY OPEN KEY

摘要

PROBLEM TO BE SOLVED: To prevent personation of communication in an environment wherein readout and forgery are allowed. SOLUTION: Portable equipment 11 confirms by a built-in function part 111 that a hash value 11231 is generated by a program main body 1121 and a secret key paired with an open key 11221 indicating the origin of a program 112. Master equipment 12 authenticates the portable equipment 11 by an open key system which uses an open key 11232 and the secret key 1131 and then decides whether or not the program 112 has the authentic origin according to the hash value confirmation result of the portable equipment 11 when the authentication is successful. When the master equipment 12 successfully authenticates the portable equipment 11 and the program 112 has the authentic origin, it is considered that the program 112 is authenticated with the open key 11221.