User equipment, authentication system, authentication method, authentication program and recording medium

摘要

Spoofing is prevented in an authentication technique using a portable terminal and the like. A portable telephone includes an authentication unit for performing personal authentication of the user, a moving distance calculating unit for calculating a linear moving distance the portable telephone has moved from a position of the portable telephone at the time the authentication unit succeeds in the personal authentication of the user; and a post-authentication communication control unit for disabling the settlement process communication if the linear moving distance calculated by the moving distance calculating unit exceeds a predetermined distance.