| 摘要 |
The possibility of unauthorized access after the authentication of a user device is decreased to increase the security of communication. An authentication system (1) judges the correctness of a user device (12) more than once during the transmission/reception of data to be transmitted even if an authentication device (11) judges that the user device (12) is a correct user device. According to the authentication system (1), the possibility of the unauthorized access after the authentication can be decreased to increase the security of the communication.
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