PROBLEM TO BE SOLVED: To assess difficulty in forgery difficulty on each biological body in relation to biometric authentication, and to prevent mistake of the biological body for the imitation without increasing risk of authentication by the counterfeit.SOLUTION: In relation to an apparatus, a method and a program for authentication, a forgery determination threshold is determined by using two parameters of forgery similarity and forgery difficulty. If a value is lower than the threshold for assessing forgery, it is determined that the object is a biologic object, and thereby easiness in impersonation with a fake of a biologic object that is easy to forge is reduced, so that false rejection due to determination in which a biologic object is erroneously determined as a fake is prevented.COPYRIGHT: (C)2009,JPO&INPIT【課題】生体認証に関し、生体毎に偽造物によるなりすまし難さを評価し、偽造物による認証の危険性を増加させることなく、生体を偽造物と誤判定することを低減させる。【解決手段】認証装置、認証方法又は認証プログラムに関し、偽造物類似度及び偽造難易度の二種類のパラメータを用いて偽造判定閾値を決定し、この偽造判定閾値以下であれば、生体であると判定することにより、偽造し易い生体の偽造物によるなりすましの容易さを防止し、生体を偽造物と誤判定することによる本人拒否を低減させたものである。【選択図】図23
