Authentication based password is very common in computer security and privacy. Most of the traditional passwords are numbers, numbers with alphabets and numbers with alphabets and symbols. That can be easily broken by the attacks such as eves dropping, dictionary attacks, social engineering and shoulder surfing attacks. However, human factors such as choosing bad passwords and keeping passwords in an insecure place are also big problems. In order to address these challenges, several graphical authentication schemes have been proposed, but still shoulder surfing attack increasing. This study proposed multiplication matrix for graphical authentication scheme to reduce shoulder surfing attack. The system attained high degree of accuracy to restrict unauthorized users.
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