Making graphic-based authentication secure against smudge attacks
Emanuel von Zezschwitz, Anton Koslow, Alexander De Luca, Heinrich Hußmann · 2013
Most of today's smartphones and tablet computers feature touchscreens as the main way of interaction. By using these touchscreens, oily residues of the users' fingers, smudge, remain on the device's display. As this smudge can be used to deduce formerly entered data, authentication tokens are jeopardized. Most notably, grid-based authentication methods, like the Android pattern scheme are prone to such attacks.