[tedmiston]

This is neat.

My roommate in grad school developed a somewhat related idea but for identifying someone's "typing cadence". He used it for an additional security factor in the way that a person types their passwords in a browser.

[walterbell]

I read an article about search engines using autocomplete keystroke timing for user fingerprinting, but can't find it at the moment. Wikipedia has a few references, https://en.m.wikipedia.org/wiki/Keystroke_dynamics

[dogma1138]

There are quite a few solutions out there that use bioinformatics to develop a signature of the user.

Google has one, a few banks use it to identify potential fraud cases appearntly even simple things about how you navigate a webpage can produce a fairly unique fingerprint even across different devices.