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SnapApp: Reducing authentication overhead with a time-constrained fast unlock option

: Buschek, D.; Hartmann, F.; Zezschwitz, E. von; Luca, A. de; Alt, F.


Kaye, J. ; Association for Computing Machinery -ACM-:
CHI Conference on Human Factors in Computing Systems 2016. Proceedings : San Jose, California, USA, May 07 - 12, 2016
New York: ACM, 2016
ISBN: 978-1-4503-3362-7
Conference on Human Factors in Computing Systems (CHI) <34, 2016, San Jose/Calif.>
Conference Paper
Fraunhofer FKIE ()

We present SnapApp, a novel unlock concept for mobile devices that reduces authentication overhead with a time-constrained quick-access option. SnapApp provides two unlock methods at once: While PIN entry enables full access to the device, users can also bypass authentication with a short sliding gesture ("Snap"). This grants access for a limited amount of time (e.g. 30 seconds). The device then automatically locks itself upon expiration. Our concept further explores limiting the possible number of Snaps in a row, and configuring blacklists for app use during short access (e.g. to exclude banking apps). We discuss opportunities and challenges of this concept based on a 30-day field study with 18 participants, including data logging and experience sampling methods. Snaps significantly reduced unlock times, and our app was perceived to offer a good tradeoff. Conceptual challenges include, for example, supporting users in configuring their blacklists.