The Current authentication systems suffer from many drawbacks we generally use knowledge based technique e.g textual passwords. In this users choose a string (combination of letters numbers etc) from their known facts like birth day mobile number etc, which make textual passwords easy to break and vulnerable to dictionary based or brute force attacks because of the knowledge of some of the traits to other persons too, moreover the malicious person can also guess the password. Secondly, Inherence authentication like biometric requires hardware. Thirdly, ownership based authentication like cards etc also require hardware etc .Now Graphical Authentication mechanisms have been proposed but they are found vulnerable to shoulder surfing attacks. In this paper we propose a combined approach of graphic, knowledge based technique and also biometric form to make authentication system computationally secure.
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