| 摘要 |
A user device, an authentication system, an authentication method, an authentication program, and a recording medium are provided to prevent someone to be not authenticated from being authenticated. An authentication unit(12) performs personal authentication of a user. A movement distance calculating unit(16) calculates a linear movement distance of a user device from a position of the user device when the authentication unit(12) succeeds in the personal authentication. A communication control unit(15) prevents communication after authentication if the linear movement distance calculated by the movement distance calculating unit(16) is more than a predetermined distance level.
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