Some other proposals based more or less on hand movements. See also:
(2010 Jul) Intel/Mariano Phielipp said that with pressure sensors and accelerometers, the Intel
remote control measures 372 different handling characteristics, thus enabling recognition.
Source:Smart TV Remote Promises To Recognize Users
(2015) Lockheed Martin technology dubbed Mandrake, measures speed, acceleration and the curve of an individual's strokes when using smartphones. Tested by the NSA.
Shiver / NeuroPrint or Neuro-Finger Print™ (NFP)
- "NeuroPrint uses proprioceptive neurophysiology"
- "The muscles in our hands are densely connected with our brain map. Those muscles in our hands shiver an average of 10 to 20 times a second, this shivering is nearly invisible and corresponds to individual muscle fibres controlling their length. It turns out the phone sensors are sensitive enough to measure those micro-vibrations in the hand."
This is close to keystroke dynamics.