People have difficulty remembering multiple passwords. This results in reduced security as users reuse the same password for different systems or reveal other passwords as they try to log in. It can also lead to reduced privacy, as users may

Discretization is used in click-based graphical passwords so that approximately correct entries can be accepted by the system. We show that the existing discretization scheme of Birget et al. (2006) allows for false accepts and false rejects beca

Textual passwords are the most common method used for authentication. But textual passwords are vulnerable to eves dropping, dictionary attacks, social engineering and shoulder surfing. Graphical passwords are introduced as alternative techniques to