Quantifying the Security of Graphical Passwords: The Case of Android Unlock Patterns

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Provided by: Ruhr-Universitat Bochum
Topic: Security
Format: PDF
Graphical passwords were proposed as an alternative to overcome the inherent limitations of text-based passwords, inspired by research that shows that the graphical memory of humans is particularly well developed. A graphical password scheme that has been widely adopted is the Android Unlock Pattern; a special case of the Pass-Go scheme with grid size restricted to 3 x 3 points and restricted stroke count. In this paper, the authors study the security of Android unlocks patterns. By performing a large-scale user study, they measure actual user choices of patterns instead of theoretical considerations on password spaces.
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