Biometric signature system and biometric signature method

A biometric signature method by a biometric signature system,

• the biometric system being configured to hold:
• a first template indicating a result of transforming, by predetermined transformation, first biometric information acquired from a predetermined part of a user;
• and
• a second template indicating a result of transforming, by predetermined one-way transformation, second biometric information acquired from the predetermined part of the user,
• wherein the biometric signature method includes:
• acquiring, by the biometric signature system, the first biometric information and the second biometric information from a person to be authenticated;
• generating, by the biometric signature system, a first template of the person to be authenticated from the acquired first biometric information;
• identifying, by the biometric signature system, a parameter for which a similarity between the first template of the person to be authenticated corrected by using the parameter and the first template held in the biometric signature system is larger than a predetermined condition;
• correcting, by the biometric signature system, the second biometric information on the person to be authenticated by using each parameter included in a predetermined range including the identified parameter;
• generating, by the biometric signature system, a second template of the person to be authenticated from each piece of corrected second biometric information;
• and
• determining, by the biometric signature system, whether authentication of the person to be authenticated is successful by comparing each generated second template with the second template held in the biometric signature system.