Authentication device, authentication method, authentication program and computer readable recording medium

摘要

An authentication device having high resistance to spoofing is provided. The portable telephone includes a camera of imaging the face of the person to be authenticated, an imaging direction comparing unit of determining whether or not the face of the person to be authenticated is imaged from diagonally below, and a main control unit of determining that the person to be authenticated is not the person in question when the imaging direction comparing unit determines that the face of the person to be authenticated is not imaged from diagonally below.