A Stroke-based Textual Password Authentication Scheme

Textual-based password authentication scheme tend to more vulnerable to attacks such as shoulder-surfing and hidden camera. To overcome the vulnerabilities of traditional methods, visual or graphical password schemes have been developed as possible alternative solutions to text-based scheme. Because simply adopting graphical password authentication also has some drawbacks, some hybrid schemes based on graphic and text were developed. In this paper, we proposed a stroke-based textual password authentication scheme. It uses shapes of strokes on the grid as the origin passwords and allows users to login with text passwords via traditional input devices. The method provides strong resistant to hidden-camera and shoulder-surfing. Moreover, the scheme has flexible enhancements to secure the authentication process. The analysis of the security of this approach is also discussed.