The authentication based on the passwords is used mostly in applications for the computer security and privacy. However, the human actions such as selecting less secured passwords credentials and inputting passwords in an insecure way are considered "the weakest link" within the authentication chain. Instead of arbitrary alphanumeric strings, users tend to select passwords either short or purposeful for simple memorization. With internet applications and mobile apps pile up, individuals will access these applications anywhere and anytime with different devices. This evolution brings good convenience however it will increases the probability of exposing passwords credentials to shoulder surfing attacks. Attackers will observe directly or use external recording devices to get users' credentials. To overcome this issue, proposed a novel authentication system named PassMatrix, which is based on graphical passwords to resist shoulder surfing attacks. With a one-time valid login indicator and change of location horizontal and vertical bars covering the complete scope of pass-images, PassMatrix offers no hint for attackers to work out or narrow down the password even they conduct multiple camera-based attacks. Implemented a PassMatrix prototype on web applications and allotted real user experiments to describee its memorability and usefulness. From the experimental result, is shown that, the proposed system achieves better resistance to shoulder surfing attacks whereas maintaining usability.

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