Abstract
In this article I report a state of art of biometric person authentication technology. Biometric person authentication or simply biometrics is widely spreading from the view point of academic and real world applications. I report such technologies and technical problem of each biometrics. For example many method proposed in finger print technology. However one unsolvable problem is distorsion of finger. I report such problems for iris vein and other biometrics. Finaly, I report new application of biometric technology beyond the world of security.
