Authentication system, authentication method, and program

An authentication system comprising:

• telephone number acquisition means for acquiring a telephone number from a terminal attempting to be authenticated;
• keyword notification means for notifying the terminal of a keyword for voice authentication;
• voice acquisition means for acquiring voice information from the call recipient by placing a call to the telephone number acquired by the telephone number acquisition means, or acquiring voice information from the caller through an incoming call from the telephone number acquired by the telephone number acquisition means;
• and
• authentication means for authenticating the terminal by verifying that the voice information acquired by the voice acquisition means matches the keyword sent by the keyword notification means.

An authentication method comprising:

• telephone number acquisition step for acquiring a telephone number from a terminal attempting to be authenticated;
• first identification information acquisition step for acquiring first identification information to identify the terminal;
• SMS sending step for sending an SMS (Short Message Service) containing access information for connecting to the system to the telephone number acquired in the telephone number acquisition step;
• second identification information acquisition step for acquiring second identification information to identify the connection source to which the connection was made by the access information;
• and
• authentication step for authenticating the terminal by verifying the consistency between the first identification information and the second identification information.

An authentication method comprising:

• telephone number acquisition step for acquiring a telephone number from a terminal attempting to be authenticated;
• keyword notification step for notifying the terminal of a keyword for voice authentication;
• voice acquisition step for acquiring voice information from the call recipient by placing a call to the telephone number acquired in the telephone number acquisition step, or acquiring voice information from the caller through an incoming call from the telephone number acquired in the telephone number acquisition step;
• and
• authentication step for authenticating the terminal by verifying that the voice information acquired in the voice acquisition step matches the keyword notified in the keyword notification step.

A non-transitory computer-readable recording medium storing a program for causing a computer to function as:

• telephone number acquisition means for acquiring a telephone number from a terminal attempting to be authenticated;
• first identification information acquisition means for acquiring first identification information to identify the terminal;
• SMS sending means for sending an SMS (Short Message Service) containing access information for connecting to the system to the telephone number acquired by the telephone number acquisition means;
• second identification information acquisition means for acquiring second identification information to identify the connection source to which the connection was made by the access information;
• and
• authentication means for authenticating the terminal by verifying the consistency between the first identification information and the second identification information.

A non-transitory computer-readable recording medium storing a program for causing a computer to function as:

• telephone number acquisition means for acquiring a telephone number from a terminal attempting to be authenticated;
• keyword notification means for notifying the terminal of a keyword for voice authentication;
• voice acquisition means for acquiring voice information from the call recipient by placing a call to the telephone number acquired by the telephone number acquisition means, or acquiring voice information from the caller through an incoming call from the telephone number acquired by the telephone number acquisition means;
• and
• authentication means for authenticating the terminal by verifying that the voice information acquired by the voice acquisition means matches the keyword notified by the keyword notification means.