A computer monitor keylogger typically refers to one of two things: a screen logger (software that captures screenshots or recordings of your monitor) or a hardware video logger (an inline physical device placed between the computer and the monitor to intercept the video signal).
While a traditional keylogger only tracks what you type on a keyboard, monitor-based logging captures exactly what you see on the screen, allowing attackers or monitoring software to bypass security measures like on-screen virtual keyboards. How They Work
Screen Scraping & Hooking: Software-based variants use system APIs to capture screenshots every time you click, hit enter, or open a new window.
Inline Video Interception: Hardware variants look like a standard adapter (such as a HDMI, DisplayPort, or VGA pass-through) plugged into the back of the computer monitor line to record raw video data to an internal storage chip.
Data Exfiltration: The captured imagery is either saved locally to be retrieved by hand later or compressed and uploaded quietly over the network to a third party. Common Uses Keyloggers: How They Work & How to Detect Them
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