| 摘要 |
An authentication system including: an authenticator that collates an object that is to be authenticated to determine whether the object is valid and sets, when the object is determined to be valid, an authentication state for the object; a detector that continuously detects, after the setting by the authenticator, the presence of the object; and an authentication canceller that cancels, when the detector detects the absence of the object, the authentication state set for the object. This configuration makes it possible to avoid an unauthorized use of the authentication system.
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