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Now you see me, now you don't. Protecting smartphone authentication from shoulder surfers

 
: Luca, A. de; Harbach, M.; Zezschwitz, E. von; Maurer, M.-E.; Slawik, B.; Hussmann, H.; Smith, M.

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Association for Computing Machinery -ACM-, Special Interest Group on Computer and Human Interaction -SIGCHI-:
CHI 2014. One of a CHInd. The 32nd Annual ACM Conference on Human Factors in Computing Systems. Conference proceedings : Toronto, Canada, April 26 - May 1
New York: ACM, 2014
ISBN: 978-1-4503-2473-1
S.2937-2946
Conference on Human Factors in Computing Systems (CHI) <32, 2014, Toronto>
Englisch
Konferenzbeitrag
Fraunhofer FKIE

Abstract
In this paper, we present XSide, an authentication mechanism that uses the front and the back of smartphones to enter stroke-based passwords. Users can switch sides during input to minimize the risk of shoulder surfing. We performed a user study (n = 32) to explore how switching sides during authentication affects usability and security of the system. The results indicate that switching the sides increases security while authentication speed stays relatively fast (≤ 4 seconds). The paper furthermore provides insights on accuracy of eyes-free input (as used in XSide) and shows how 3D printed prototype cases can improve the back-of-device interaction experience.

: http://publica.fraunhofer.de/dokumente/N-362455.html