SERVICE PROVIDING SYSTEM, SERVICE PROVIDING METHOD, PORTABLE COMMUNICATION TERMINAL AND SERVER

摘要

A service providing system includes a portable communication terminal operated by a user; a service providing apparatus providing a service to the user, and a server managing the service providing apparatus, wherein the service providing apparatus calculates a response using a challenge, and the portable communication terminal transmits a challenge generated by the server to the service providing apparatus subjected to a legitimacy check of the service providing apparatus and presents a result of the legitimacy check based on a response calculated by the service providing apparatus subjected to the legitimacy check using the transmitted challenge.