Authentication device, authentication system, authentication method, andauthentication program

An authentication system which authenticates a target comprising:

• an imaging device which captures a face image of the target;
• a memory storing instructions;
• and
• one or more processors configured to execute the instructions to:
• output a plurality of candidate responses to questions to the target on a display device;
• specify a response to the question from among the candidate responses based on a target's gaze in the captured face image;
• make a correctness or incorrectness judgment of the specified response;
• perform target's face authentication from the captured face image;
• perform target's biometrics determination based on changes in the target's gaze detected from a plurality of the face image;
• and
• authenticate the target based on results of the correctness or incorrectness judgment, the biometrics determination, and the face authentication.

An authentication method which authenticates a target comprising:

• outputting a plurality of candidate responses to questions to the target on a display device;
• specifying a response to the question from among the candidate responses based on a target's gaze in a face image captured by an imaging device that captures a face image of the target;
• making a correctness or incorrectness judgment of the specified response;
• performing target's face authentication from the face image captured by the imaging device;
• performing target's biometrics determination based on changes in the target's gaze detected from a plurality of the face image;
• and
• authenticating the target based on results of the correctness or incorrectness judgment, the biometrics determination, and the face authentication.