A hardware keylogger is a tiny electronic device capable of capturing keystrokes from a PS/2 or USB keyboard. A keylogger contains advanced electronic circuitry for monitoring a keyboard's USB or PS/2 connection, filtering keystroke data, and recording the data to internal memory. The built-in memory typically has several megabytes (or even gigabytes), meaning it can hold years-worth of typing. A hardware keylogger is completely undetectable for software running on the computer, such as anti-virus programs and security scanners. A hardware keylogger also requires no software or drivers, meaning the installation process can be done in a matter of seconds. Just plug the keylogger in-between the keyboard and the USB or PS/2 socket on the computer's rear side.
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