Key clicks betray passwords, typed text
Eavesdroppers armed with a shotgun microphone or a small recording device could make off with a computer user's sensitive documents and data, three university researchers said in a paper released this week. The researchers, from the University of California at Berkeley, found that a 10-minute recording of a person typing at the keyboard reveals enough information for a computer analysis to recover nearly 90 per cent of the words entered. The recording can be low quality - the researchers used a $10 microphone - and the system does not need previous samples of a user's typing to perform the analysis. Moreover, the technique can frequently guess a person's password in as little as 20 attempts.
For the rest, click Here