You know your phone can be tapped, but you probably think you have complete privacy when typing on your computer keyboard. However, spies can eavesdrop on what you’re writing by listening to the sounds of your keystrokes.

IBM research scientist Dmitri Asonov says that every key on computer keyboards, telephones and even ATM machines makes a unique sound as it’s pressed and released. All you need to listen is $200 worth of microphones and sound processing software. Asonov says he can decipher keystrokes with 80% accuracy.

The sounds are made because keyboards and keypads all have a rubber membrane underneath the keys. Asonov says, “This membrane acts like a drum, and each key hits the drum in a different location and produces a unique frequency or sound that the neural networking software can decipher.”

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