Authentication method, terminal device, relay device and authentication server

摘要

A terminal device in the present invention includes a first authentication information transmitter configured to transmit first authentication information including a user ID to a relay device, a temporary ID storage configured to store a temporary ID issued by an authentication server receiving the first authentication information via the relay device, and a second authentication information transmitter configured to transmit second authentication information including the temporary ID and an authentication server ID for identifying the authentication server to the relay device.