This book involves interdisciplinary research in the field of Biometric Authentication System with several modern adaptive algorithms. It descries efficient techniques and methodologies of voice, face and palm vein authentication systems. This book focuses on how more efficient algorithms of voice, face and palm vein recognition systems can be adaptive in modern secure biometric authentication systems. The voice recognition system is designed and implemented using VLSI chips. Several algorithms using GLC Matrix has been successfully implemented in human faces with various emotions. Vascular Pattern Analysis has been introduced with our proposed algorithms named VPPA, VPGBCA, VPTA and PIBIMA for making more secure Biometric Authentication system in Palm Vein domain. In addition with these modified algorithms, the proposed matching algorithms will give an edge towards modern effective Biometric Authentication System.