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Users could soon be asked to pull a series of faces to unlock their Android phones or tablets.
Google has filed a patent suggesting users stick out their tongue or wrinkle their nose in place of a password.
It says requiring specific gestures could prevent the existing Face Unlock facility being fooled by photos.Google Files Facial Password Patent [bbc.co.uk]
However, Google acknowledges even this might not be enough, envisaging a situation in which a device could be programmed to generate a video showing the user making the requested facial expressions.
What makes you think this is not already happening?