Method of authentication for protecting agent and messages

PURPOSE: An authentication method for protecting an agent and a message is provided, which defends the attack from a malicious agent and message level, and assures authentication at an initial access trial process. CONSTITUTION: According to the authentication method, a transmitter agent(1) request authentication to a facilitator(2) in order to transfer a message to an unknown agent. The facilitator performs mutual authentication with the transmitter agent and then exchanges a session key. The facilitator finds an agent coinciding with its object and performs mutual authentication, and then exchanges the session key. And the transmitter agent constitutes an independent security channel with a receiver agent(3) selected using the session key.