Authentication device and authentication system

Abstract

The present invention provides an authentication device and authentication system that can easily authenticate the user of a vehicle while making it difficult to duplicate the matching data, thereby more reliably preventing unauthorized use of the vehicle by third parties. [Solution] The authentication device 10 comprises a detection unit 77, a determination unit 79, and a second authentication unit 83. The detection unit 77 detects the current value of the primary coil 21 when the secondary coil 31 of the secondary circuit 30 provided in the smart key 5 is facing the primary coil 21 of the primary circuit 20 provided in the vehicle 3. The determination unit 79 determines whether the detected current value is above a threshold. The second authentication unit 83 authenticates the smart key 5 if the determination unit 79 determines that the current value is above a threshold. When the magnetic field resonance frequency of the secondary coil 31 is equal to the magnetic field resonance frequency of the primary coil 21, the primary coil 21 and the secondary coil 31 enter a resonant state when the secondary coil 31 is facing the primary coil 21.

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