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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, the authors propose two novel graphical password methods based on recognition of icons to solve the hotspot problem without decreasing the password space. The experiment they have conducted that compares the security and usability of proposed methods with earlier work (i.e., Pass-points) shows that hotspot problem can be eliminated if a small increase in password entrance and confirmation times is tolerable.
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