Two mechanical arms control the ball’s spin and tilt, and the keylogger read out the position of those arms. Thus, each character on the Selectric’s type element ball has its own signature.

Keyloggers can spy on your keystrokes, but attacks are rare and specific, as they require greater effort from attackers. Hardware keyloggers are hidden physical devices, while software keyloggers ...

This is important to remember when we talk about software and hardware keyloggers, but you should know that anything you type on your computer has to be processed inside it, and therefore can be ...

Two mechanical arms control the ball’s spin and tilt, and the keylogger read out the position of those arms. Thus, each character on the Selectric’s type element ball has its own signature.