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A Visibility-Based Upper Bound for Android Unlock Patterns
- A Visibility-Based Upper Bound for Android Unlock Patterns
- Lee, J[Lee, Jinwoo]; Seo, J[Seo, Jae Woo]; Cho, K[Cho, Kookrae]; Lee, PJ[Lee, Pil Joong]; Kim, J[Kim, Juneyeun]; Choi, SH[Choi, Seung Hoon]; Yum, DH[Yum, Dae Hyun]
- DGIST Authors
- Cho, K[Cho, Kookrae]
- Issue Date
- IEICE Transactions on Information and Systems, E99D(11), 2814-2816
- Article Type
- Android Unlock Patterns; Graphical Password; Upper Bound; User Authentication
- The Android pattern unlock is a popular graphical password scheme, where a user is presented a 3 × 3 grid and required to draw a pattern on the onscreen grid. Each pattern is a sequence of at least four contact points with some restrictions. Theoretically, the security level of unlock patterns is determined by the size of the pattern space. However, the number of possible patterns is only known for 3 × 3 and 4 × 4 grids, which was computed by brute-force enumeration. The only mathematical formula for the number of possible patterns is a permutation-based upper bound. In this article, we present an improved upper bound by counting the number of "visible" points that can be directly reached by a point. © 2016 The Institute of Electronics, Information and Communication Engineers.
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- Companion Diagnostics and Medical Technology Research Group1. Journal Articles
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