Keystroke logging

Keystroke logging, often referred to as keylogging or keyboard capturing, is the action of recording (logging) the keys struck on a keyboard,[1][2] typically covertly, so that a person using the keyboard is unaware that their actions are being monitored. Data can then be retrieved by the person operating the logging program. A keystroke recorder or keylogger can be either software or hardware.

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While the programs themselves are legal,[3] with many designed to allow employers to oversee the use of their computers, keyloggers are most often used for stealing passwords and other confidential information.[4][5]

Keylogging can also be used to study keystroke dynamics[6] or human-computer interaction. Numerous keylogging methods exist, ranging from hardware and software-based approaches to acoustic cryptanalysis.