Smudge Attacks on Smartphone Touch Screens

2012-11-04

Smudge Attacks on Smartphone Touch Screens

I long suspected that slide lock patterns are next to useless, particularly in the world of pervasive CCTV. It's insecure even without prior observation of the pattern:

Using photographs taken under a variety of lighting and camera positions, we showed that in many situations full or partial pattern recovery is possible, even with smudge “noise” from simulated application usage or distortion caused by incidental clothing contact.

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