Biometric authentication device, biometric authentication method, and storage medium

A biometric authentication method comprising:

• a signal pattern generating process that generates a signal pattern of a signal transmitted to a living body;
• a signal transmitting process that transmits a signal to the living body based on the signal pattern generated by the signal pattern generating process;
• a signal receiving process that receives a response signal transmitted from the living body, the received response signal being in response to the transmitted signal that is based on the generated signal pattern;
• a transfer feature calculating process that calculates a transfer feature of a signal transmitted through the living body based on the signal pattern generated by the signal pattern generating process and the response signal received by the signal receiving process;
• a feature extracting process that extracts a feature amount based on the transfer feature that is calculated, the feature amount varying for every living body;
• and
• a feature amount collating process that collates the extracted feature amount with a feature amount stored in a feature amount storing unit in advance,
• wherein the signal pattern is changed every time the signal pattern is generated in the signal pattern generating process.

A storage medium that stores a biometric authentication program making a biometric authentication device comprising a signal transmitting unit that transmits a signal to a living body and a signal receiving unit that receives a response signal transmitted through the living body to perform biometric authentication based on the response signal achieve the following:

• a signal pattern generating unit that generates a signal pattern of a signal transmitted to the living body and outputs the signal pattern that is generated to the signal transmitting unit;
• a transfer feature calculating unit that calculates a transfer feature of a signal transmitted through the living body based on the signal pattern from the signal pattern generating unit and the response signal received by the signal receiving unit;
• a feature amount extracting unit that extracts a feature amount based on the transfer feature that is calculated, the feature amount varying for every living body;
• and
• a feature amount collating unit that collates the extracted feature amount with a feature amount stored in a feature amount storing unit in advance,
• wherein the signal pattern generating unit achieves change of the signal pattern every time the signal pattern generating unit generates the signal pattern, and
• wherein the received response signal is in response to the transmitted signal.