Several of these already. Here is one from 2014, https://crypto.stanford.edu/gyrophone/ https://crypto.stanford.edu/gyrophone/ Seem to remember an impressive o

Several of these already. Here is one from 2014, https://crypto.stanford.edu/gyrophone/ https://crypto.stanford.edu/gyrophone/ Seem to remember an impressive one from this year using modern deep learning, but could not find it now.