| 摘要 |
According to an aspect of an embodiment, an authentication apparatus comprises a determining unit and a authenticating unit. The determining unit determines, on the basis of authentication information input by an operation of a user, whether the operation of the user is performed as predetermined as to which of valid and invalid information is to be input. The authenticating unit for repeats the determining processing of the determining unit at least twice and authenticates the user if it is determined, in every iteration of the determining processing, that the operation of the user is performed as predetermined.
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