Authentication device, authentication system, authentication method, and non-transitory storage medium storing program

An authentication system comprising:

• a biological information measuring device;
• and
• an authentication device capable of communicating with the biological information measuring device, wherein
• the biological information measuring device includes
• a measurement unit configured to measure a value related to blood pressure, an electrocardiogram, and
• a first communication interface configured to transmit measurement data including a measured value acquired by the measurement unit, and measurement time information associated with the measured value, measurement time information indicating a time at which measurement of the blood pressure is carried out, and
• the authentication device includes
• a second communication interface configured to receive the measurement data from the biological information measuring device,
• a sensor unit including at least one sensor, and
• a controller configured to
• provide a function to be used by one specific user,
• estimate, on the basis of information acquired by the sensor unit, a state of the one specific user during a time range specified by the measurement time information, the state of the one specific user including a behavioral pattern comprising information indicating whether the one specific user is in a static state or a dynamic state during the measurement of the blood pressure,
• identify that the measured value pertains to the one specific user in a case where the function is in an enabled state during the time range and a behavioral pattern estimated by the controller matches a reference behavioral pattern associated with the blood pressure;
• and
• identify that the measured value does not pertain to the one specific user in a case where the function is not in an enabled state during the time range or the behavioral pattern estimated by the controller does not match the reference behavioral pattern associated with the blood pressure, the reference behavioral pattern associated with the blood pressure being defined as a behavioral pattern in which a user is in a static state during the measurement of the blood pressure.

An authentication method executed by an authentication device including a sensor unit including at least one sensor, the authentication method comprising the steps of:

• acquiring measurement data including a measured value and measurement time information associated with the measured value from a biological information measuring device configured to measure a value related to blood pressure, the measurement time information indicating a time at which measurement of the blood pressure is carried out;
• providing a function to be used by one specific user;
• estimating, on the basis of information acquired by the sensor unit, a state of the one specific user during a time range specified by the measurement time information, the state of the one specific user including a behavioral pattern comprising information indicating whether the one specific user is in a static state or a dynamic state during the measurement of the blood pressure;
• identifying that the measured value pertains to the one specific user in a case where the function is in an enabled state during the time range and behavioral pattern estimated by the controller matches a reference behavioral pattern associated with the blood pressure;
• and
• identifying that the measured value does not pertain to the one specific user in a case where the function is not in an enabled state during the time range or the behavioral pattern estimated by the controller does not match the reference behavioral pattern associated with the blood pressure, the reference behavioral pattern associated with the blood pressure being defined as a behavioral pattern in which a user is in a static state during the measurement of the blood pressure.