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Multi-Touch Authentication on Tabletops

by David Kim, Paul Dunphy, Pam Briggs, Jonathan Hook, John Nicholson, James Nicholson, Patrick Olivier
ACM Conference on Human Factors in Computing Systems (CHI) ()

Abstract

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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