Hollow-pass : hide your pattern password from shoulder surfers

This paper introduces Hollow-Pass, a new approach to combat shoulder surfing attacks on pattern passwords, a type of graphical password (GP) schema. Hollow-Pass does not necessitate external devices and renders the grid and pattern imperceptible to distant shoulder surfers. The usability and security of Hollow-Pass were evaluated through two types of user tests, online and onsite. Results showed that Hollow-Pass is successful in resisting shoulder surfing for simple patterns at various viewing angles (front, left-front, and right-front) and distances (1.0m, 1.5m, and 2.0m).