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2008

Centered Discretization with Application to Graphical Passwords

9 years 1 months ago
Centered Discretization with Application to Graphical Passwords
Discretization is used in click-based graphical passwords so that approximately correct entries can be accepted by the system. We show that the existing discretization scheme of Birget et al. (2006) allows for false accepts and false rejects because the tolerance region is not guaranteed to be centered on the original click-point, causing usability and security concerns. Using empirical data from a large user study, we show that this is a significant issue in practice. We then introduce Centered Discretization, a simpler discretization method that eliminates false accepts and false rejects. It also allows for smaller tolerance regions without impacting the usability of the system.
Sonia Chiasson, Jayakumar Srinivasan, Robert Biddl
Added 02 Oct 2010
Updated 02 Oct 2010
Type Conference
Year 2008
Where NSDI
Authors Sonia Chiasson, Jayakumar Srinivasan, Robert Biddle, Paul C. van Oorschot
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