No only a keylogger, but a "soundlogger" would also work.
Checking long posts on news sites or blogs just to make sure it is the writer would be interesting, but boring and not worth it.
Checking long posts on news sites or blogs just to make sure it is the writer would be interesting, but boring and not worth it.
http://www.cs.berkeley.edu/~tygar/keyboard.htm
"We examine the problem of keyboard acoustic emanations.
We present a novel attack taking as input a 10-minute sound recording of a user
typing English text using a keyboard, and then recover- ing up to 96% of typed
characters. There is no need for a labeled training recording. Moreover the
recognizer bootstrapped this way can even recognize random text such as
passwords: In our experi- ments, 90% of 5-character random passwords using only
letters can be generated in fewer than 20 attempts by an adversary; 80% of 10-
character passwords can be generated in fewer than 75 attempts.Now, visit it from a different browser or computer and make another comment - it would log you in as you again, somehow.
Errors would likely make it unpractical, but it'd be an amusing demo for the unaware.