De Luca, A. and Von Zezschwitz, E. and Nguyen, N.D.H. and Maurer, M.-E. and Rubegni, E. and Scipioni, M.P. and Langheinrich, M. (2013) Back-of-Device authentication on smartphones. In: CHI '13 Proceedings of the SIGCHI Conference on Human Factors in Computing Systems Pages 2389-2398. ACM, pp. 2389-2398. ISBN 9781450318990
Full text not available from this repository.Abstract
This paper presents BoD Shapes, a novel authentication method for smartphones that uses the back of the device for input. We argue that this increases the resistance to shoulder surfing while remaining reasonably fast and easy-to-use. We performed a user study (n = 24) comparing BoD Shapes to PIN authentication, Android grid unlock, and a front version of our system. Testing a front version allowed us to directly compare performance and security measures between front and back authentication. Our results show that BoD Shapes is significantly more secure than the three other approaches. While performance declined, our results show that BoD Shapes can be very fast (up to 1.5 seconds in the user study) and that learning effects have an influence on its performance. This indicates that speed improvements can be expected in long-term use. Copyright 2013 ACM.