User authentication is one of the most important part of informationsecurity. Computer security most commonly depends on passwords to authenticatehuman users. Password authentication systems will be either been usable but notsecure, or secure but not usable. While there are different types ofauthentication systems available alphanumeric password is the most commonlyused authentication mechanism. But this method has significant drawbacks. Analternative solution to the text based authentication is Graphical UserAuthentication based on the fact that humans tends to remember images betterthan text. Graphical password authentication systems provide passwords whichare easy to be created and remembered by the user. However, the main issues ofsimple graphical password techniques are shoulder surfing attack and imagegallery attack. Studies reveals that most of the graphical passwords are eithersecure but not usable or usable but not secure. In this paper, a new techniquethat uses cued click point graphical password method along with the one-timesession key is proposed. The goal is to propose a new authentication mechanismusing graphical password to achieve higher security and better usabilitylevels. The result of the system testing is evaluated and it reveals that theproposed system ensures security and usability to a great extent.
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