Keystroke logging is the process of recording every keystroke made on a keyboard. You've probably heard about "keyloggers" while reading into malware – the tools used to carry out keystroke logging.

Keystroke logging involves the tracking of every interaction you make with a button on your keyboard. When you press a key, you're "speaking" to your computer, telling it what function you want it ...

Kamkar says that his keystroke spying trick works best when he can aim his laser at a spot on a laptop that reflects light—ideally a shiny metal or plastic spot on the laptop's case, such as a logo.