This is a well-known technology :-) See http://en.wikipedia.org/wiki/Keystroke_dynamics http://en.wikipedia.org/wiki/Keystroke_dynamics In the research communi

This is a well-known technology :-) See http://en.wikipedia.org/wiki/Keystroke_dynamics http://en.wikipedia.org/wiki/Keystroke_dynamics In the research community it's a proven and accepted concept. There are products in the market that do two-factor authentication based on password + keystroke dynamics, but I don't know how well they work.