It is no secret that hackers can find out which keys you press. To do this, a hacker needs to install a key-logger (See 1 & 2) on the victim's computer. However, it is already possible to simply find out what a person is typing just by the sound from the microphone or, let's say, an IoT device speakers. But how does it work exactly? Let's get to the bottom of it! Each key on the keyboard has a unique sound. The distance between the keys, the microphone, and the rate at which th...
