Biometric authentication device and biometric authentication method

摘要

A biometric authentication device performs authentication of a user based on biometric information. In the biometric authentication device, a registry information storage stores pre-registered biometric information as registry information. An acceptance value determiner determines a verification acceptance value used for authentication, based on quality of the registry information with regard to reliability of characterizing an individual. An authentication information acquirer obtains biometric information of a user as authentication information. A similarity calculator compares the authentication information of the user with the registry information and calculates similarity between the authentication information and the registry information. An authenticator identifies whether the user is a registrant corresponding to the registry information, based on the similarity and the verification acceptance value.