Patent ID: 8918643

Claim:
An authentication device for performing authentication of a user based on information received from a portable terminal owned by the user, the authentication device comprising: a communication unit that establishes a communication connection with the portable terminal; a storage unit that stores registration information for authentication of the user of the portable terminal, the registration information including first authentication information and second authentication information; an authenticating unit that performs a registration process of storing, in the storage unit, the first authentication information acquired from the portable terminal and the second authentication information generated by the authenticating unit for the portable terminal, and transmitting to the portable terminal the second authentication information to be stored therein, and performs authentication by comparing the first authentication information and the second authentication information stored in the storage unit with the first authentication information and the second authentication information received from the portable terminal, respectively, wherein the communication unit permits the communication connection with the portable terminal when the first authentication information stored in the storage unit matches the first authentication information received from the portable terminal, and the authenticating unit performs authentication after the communication connection is permitted, by comparing the second authentication information stored in the storage unit with the second authentication information received from the portable terminal.