Importance

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Abstract

A shared key management server generates a shared key by using an issue request of a shared key, output from a terminal through a second communication network, as a trigger, and informs an authentication unit and the terminal through a second communication network of the generated shared key. The authentication unit authenticates true/false of the terminal by using an authentication request, output from the terminal based on the shared key, as a trigger, and informs the terminal of the authentication result. The terminal outputs to the authentication unit an authentication request based on the shared key by using the information from the shared key management server as a trigger, and performs data communications based on the shared key through the first communication network by using the authentication result as a trigger.

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First Claim