Authentication device, authentication system, authentication method, and storage medium

A portable authentication device comprising:

• a communication interface that communicates with another authentication device comprising a sensor that detects a biometric information of a subject;
• the other authentication device that executes a first authentication process using the biometric information and transmits the biometric information to the portable authentication device;
• and
• a hardware processor that:
• executes a second authentication process using the biometric information;
• and
• while a predetermined condition is satisfied after the subject is authenticated as being valid by the second authentication process, transmits an information to an apparatus to cause the apparatus to authenticate the subject when the subject is authenticated by the first authentication process as being valid.

An authentication method using a portable authentication device, the authentication device comprises a sensor that detects a biometric information of a subject, and a communication interface that communicates with another authentication device, the method comprising:

• executing a first authentication process using the biometric information;
• transmitting the biometric information to the other authentication device via the communication interface to cause the other authentication device to execute a second authentication process using the detected biometric information;
• and
• while the subject is authenticated as being valid by the second authentication process and a predetermined condition is satisfied, transmitting an information to an apparatus to cause the apparatus to authenticate the subject when the subject is authenticated by the first authentication process as being valid.

An authentication method using a portable authentication device, the method comprising:

• communicating with another authentication device that comprises a sensor that detects a biometric information of a subject, wherein the other authentication device executes a first authentication process using the biometric information;
• executing a second authentication process using the biometric information received from the other authentication device;
• and
• while the subject is authenticated as being valid by the second authentication process and a predetermined condition is satisfied, transmitting an information to an apparatus to cause the apparatus to authenticate the subject when the subject is authenticated by the first authentication process as being valid.

A portable authentication device comprising:

• a sensor that detects a biometric information of a subject;
• a communication interface that wirelessly communicates with a terminal device that is portable;
• and
• a hardware processor that:
• executes an authentication process based on the biometric information and makes the authentication process different in precision based on a strength of a signal received from the terminal device.

An authentication method comprising:

• obtaining a biometric information of a subject;
• wirelessly communicating with a terminal device that is portable;
• and
• executing, using the biometric information, an authentication process different in precision based on a strength of a signal received from the terminal device.