You may find this interesting - the technique has been used before to do unsupervised recovery of keystrokes: "Cracking Passwords using Keyboard Acoustics and

You may find this interesting - the technique has been used before to do unsupervised recovery of keystrokes: "Cracking Passwords using Keyboard Acoustics and Language Modeling" http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.186.2078&rep=rep1&type=pdf http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.186...