Multi-touch Authentication on Tabletops

by David Kim, Paul Dunphy, Pam Briggs, Jonathan Hook, John W Nicholson, James Nicholson, Patrick Olivier
Proceedings of the 28th International Conference on Human Factors in Computing Systems (CHI'10) ()
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The introduction of tabletop interfaces has given rise to the need for the development of secure and usable authentica- tion techniques that are appropriate for the co-located col- laborative settings for which they have been designed. Most commonly, user authentication is based on something you know, but this is a particular problem for tabletop interfaces, as they are particularly vulnerable to shoulder surfing given their remit to foster co-located collaboration. In other words, tabletop users would typically authenticate in full view of a number of observers. In this paper, we introduce and eval- uate a number of novel tabletop authentication schemes that exploit the features of multi-touch interaction in order to in- hibit shoulder surfing. In our pilot work with users, and in our formal user-evaluation, one authentication scheme - Pressure-Grid - stood out, significantly enhancing shoulder surfing resistance when participants used it to enter both PINs and graphical passwords.

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