AUTHENTICATION SERVER, SERVICE PROVIDING SERVER, AUTHENTICATION METHOD, COMMUNICATION TERMINAL, AND LOG-IN METHOD

摘要

PROBLEM TO BE SOLVED: To provide an authentication server, a service provision server, an authentication method, a communication terminal and a log-in method for performing user authentication with higher security.

SOLUTION: An authentication server 300 is provided with: a voiceprint extraction/registration part 330 for registering featured values of utterance data received from a communication terminal in association with user ID; a cryptographic key generation part 340 for generating a cryptographic key from the featured values, and for transmitting the key to a communication terminal; a collation part 350 for determining whether or not the featured values of the utterance data are equal to the featured values registered so as to be associated with the user ID when utterance data corresponding to user ID and the encrypted password are transmitted from the communication terminal, and a password decoding part 360 for decoding the encrypted password by the cryptographic key generated by the cryptographic key generation part 340 from the featured values when those featured values are equal, and transmitting the password associated with the user ID to a service provision server 200 which provides an information service.

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