Via Forever Geek, computer scientists at the University of California at Berkeley have managed to crack passwords simply by listening.

Off-the-shelf microphones are used to listen to the sound of your password being typed in. The program then does a bit of processing to attempt to work our your password. 96% of the characters are eventually correct.

The article says: “Tygar said that when assigned to crack a 10-digit password, the software replies with 75 possibilities. ”This means we can break into one of every 75 people’s accounts, on the first try,” he said.”

Forever Geek also points to a 2003 article regarding security of wireless keyboards.