An enhanced drawing reproduction graphical password strategy

Authors:
Xi-Yang Liu;Hai-Chang Gao;Li-Ming Wang;Xiu-Ling Chang
Affiliations:
Software Engineering Institute, Xidian University, Shaanzi, China;Software Engineering Institute, Xidian University, Shaanzi, China;Software Engineering Institute, Xidian University, Shaanzi, China;Software Engineering Institute, Xidian University, Shaanzi, China
Venue:
Journal of Computer Science and Technology - Special issue on Natural Language Processing
Year:
2011

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Abstract

Passwords are used in the vast majority of computer and communication systems for authentlcation. The greater security and memorability of graphical passwords make them a possible alternative to traditional textual passwords. In this paper we propose a new graphical password scheme called YAGP, which is an extension of the Draw-A-Secret (DAS) scheme. The main difference between YAGP and DAS is soft matching. The concepts of the stroke-box, image-box, trend quadrant, and similarity are used to describe the images characteristics for soft matching. The reduction in strict user input rules in soft matching improves the usability and therefore creates a great advantage. The denser grid granubtrity enables users to design a longer password, enlarging the practical password space and enhancing security. Meanwhile, YAGP adopts a triple-register process to create multi-templates, increasing the accuracy and memorability of characteristics extraction. Experiments illustrate the effectiveness of YAGP.