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    Graphical Passwords as Browser Extension: Implementation and Usability Study
    (SPRINGER-VERLAG BERLIN, 2009) Bicakci, Kemal; Yuceel, Mustafa; Erdeniz, Burak; Gurbaslar, Hakan; Atalay, Nart Bedin
    Today, most Internet applications still establish user authentication with traditional text based passwords. Designing a secure as well as a user-friendly password-based method has been on the agenda of security researchers for a long time. On one hand, there are password manager programs which facilitate generating site-specific strong passwords from a single user password to eliminate the memory burden due to multiple passwords. On the other hand, there are studies exploring the viability of graphical passwords as a more secure and user-friendly alternative. In this paper, we present GPEX, a password manager program implemented as a web browser plug-in to enable using graphical passwords to secure Internet applications without any need to change their authentication interface. Experimental results show that GPEX has security and usability advantages over other password manager plug-ins. specifically; we find that with the visual interface of GPEX, users have a more complete and accurate mental model of the system and incorrect login attempts causing security exposures can easily be avoided.
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    Towards Usable Solutions to Graphical Password Hotspot Problem
    (IEEE, 2009) Bicakci, Kemal; Atalay, Nart Bedin; Yuceel, Mustafa; Gurbaslar, Hakan; Erdeniz, Burak
    Click based graphical passwords that use background images suffer from hot-spot problem. Previous graphical password schemes based on recognition of images do not have a sufficiently large password space suited for most Internet applications. In this paper, we propose two novel graphical password methods based on recognition of icons to solve the hotspot problem without decreasing the password space. The experiment we have conducted that compares the security and usability of proposed methods with earlier work (i.e. Passpoints) shows that hotspot problem can be eliminated if a small increase in password entrance and confirmation times is tolerable.