Graphical passwords lead to using pictures (also draw-ings) as passwords. In theory, graphical passwords are more comfortable to remember, since humans remember pictures better than words. Also, they should be more resistant to brute-force attacks, because the research space is practically inﬁnite. In usual, graphical passwords techniques are classic-ﬁed into two main sections.
The proposed authentication system operates as follows. At the time of registration, a user performs a graphical password by ﬁrst opening a picture he or she wants. The user then takes several point-of-interest (POI) areas in the picture. Each POI is defined by a circle (center and radius). For every POI, the user types a word or phrase that would be connected with that POI.