Abstract
The goal of knowledge-based authentication system is to guide the users in creating graphical passwords. User often creates memorable passwords that are easy for attackers to guess, but strong system assigned passwords are difficult for user to remember. So the researchers of modern days use alternative methods where graphical pictures are used as a password. Human brain is good in remembering picture than textual character. Various graphical password techniques are used, now PCCP with dynamic user blocks approach presents a more feasible way of varying the security level depending upon the user's requirements. The proposed system lets the user to select the security level. In order to help the user to memorize the password audio support can also be provided. The system influence the user to create a click based graphical password, which is more random, so that it will be difficult for the hackers to guess it.
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