A pre-touch 3D pattern lock is shown in a six-person pilot to be smudge-immune and harder to shoulder-surf than a PIN, but slower and error-prone.
Aviv, Katherine Gibson, Evan Mossop, Matt Blaze, and Jonathan M
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Augmented Unlocking Techniques for Smartphones Using Pre-Touch Information
A pre-touch 3D pattern lock is shown in a six-person pilot to be smudge-immune and harder to shoulder-surf than a PIN, but slower and error-prone.