With the development of consumer electronics, the demand for simple, convenient, and high-security authentication systems for protecting private information stored in mobile devices has steadily increased. Security is essential one. Private information is traditionally provided by using passwords or Personal Identification Numbers. Passwords if used correctly are low risk, cost effective. One can easily hack the passwords from others. To overcome the password attack problems, biometrics techniques are implemented. In this paper deals with providing security and types of biometric methods. I assure that my paper will assist you to know this technique, not only the benefits but also their limitations. In this paper, we propose a real-time embedded finger-vein recognition system for authentication on mobile devices.