Memorability rates of graphical password schemes

Passwords authentication has become a widely recognized element of computer security for confirming users' identity before access can be granted or repudiated to an intended information contents or applications of the system. Graphical password schemes are a login option that use images instead of alphanumeric strings for the purpose of user authentication. This alternative means of authentication is mainly designed to achieve good memorability and secutity of any choosen passwords based on widely known superiority effect of images over random strings. This paper provides a comprehensive survey of graphical password schemes and reports a memorability comparison between them. It also highlights how different memory tasks affect the graphical passwords and the relationship between the