| CPC H04L 63/0861 (2013.01) | 6 Claims |
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5. A biometric authentication method comprising:
by a biometric authentication device,
receiving a response signal from a client device, the response signal being a signal in which a probe signal changed by being transmitted through a body or on a surface of the body of an authentication subject, the probe signal being a signal applied to the authentication subject by the client device,
generating a same probe signal as the probe signal applied by the client device;
calculating a transfer characteristic of the authentication subject using the generated probe signal and the response signal; and
authenticating the authentication subject by comparing a previously registered transfer characteristic and the calculated transfer characteristic,
wherein the probe signal is configured of a pattern, a frequency of which changes over time, and
by a client device,
replaying the probe signal;
outputting the replayed probe signal toward the authentication subject;
measuring the response signal from the authentication subject; and
transmitting the response signal measured to the biometric authentication device, wherein
the biometric authentication device further performs operation to receive the response signal,
the client device and the biometric authentication device each store information on a previously registered transfer characteristic,
first authentication related to the authentication subject is performed by the client device, based on the previously registered transfer characteristic and the response signal measured, and
second authentication related to the authentication subject is performed by the biometric authentication device.
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