Touch me once and i know it's you!: implicit authentication based on touch screen patterns

By Alexander De Luca, Alina Hang, Frederik Brudy, Christian Lindner, Heinrich Hussmann. International Conference on Human Factors in Computing Systems, 2012

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You Are How You Touch: User Verification on Smartphones via Tapping Behaviors (2014, background): “The actual value in pixels corresponding to the touch is normalized with the device’s specific range and is scaled to a value between 0 and 1.”
Touchalytics: On the Applicability of Touchscreen Input as a Behavioral Biometric for Continuous Authentication (2012, background): “sture, 2.6%-3.9% if two gestures were combined, and 3% with one unique gesture for each user. There are signicant dierences in the problem setting of these two papers and our contribution. While in [28, 27], a dened entry-point is required for the user to authenticate, we aim at an implicit and cont”