Biometric authentication method, media for individual authentication, and biometric authentication device

摘要

A biometric authentication device (4) which detects one or more body characteristics, performs verification against registered biometric data, and performs individual authentication, by which confidentiality is improved even when biometric data is separated, distributed and stored. A biometric information key is created from biometric data detected by a detection device (4), the biometric data is divided into a plurality of portions, and the portions are stored on different media. The biometric information key is stored on one medium, and at the time of authentication, the separated biometric data portions are combined and a biometric information key is created and is compared with the biometric information key, to judge the linked relationship. Hence confidentiality of the association of the individual separated data portions can be improved even when the biometric data is separated, distributed and stored, contributing to prevent illicit use resulting from leakage or theft of biometric data.