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. http://www.bbc.co.uk/news/technology-22790221 The document – which was filed in June 2012 but has only just been published – suggests the software could track a “facial landmark” to confirm a user not only looks like the device’s owner but also carries out the right action.  Such efforts might help address criticism that its current face detection software is insecure.
Last year Google introduced a “liveness check”, requiring users to blink at their device to prevent its facial recognition program being fooled by a photograph.
The latest patent says the additional checks should prevent such a spoof working, adding that a combination of specific gestures – such as a request for a blink followed by a half turn of their head and then a wink – could be issued at random to make it even harder to deceive the ID feature.
The device could also “emit light beams having different colours or frequencies, that are expected to induce in the eyes of a user a reflection of light having a corresponding frequency content”.