A hard drive's LED light can be used to covertly leak data

The seemingly harmless blinking lights on servers and desktop PCs may give away secrets if a hacker can hijack them with malware.

Researchers in Israel have come up with an innovative hack that turns a computer's LED light into a signaling system that shows passwords and other sensitive data.

The researchers at Ben-Gurion University of the Negev demonstrated the hack in a YouTube video posted Wednesday. It shows a hacked computer broadcasting the data through a computer’s LED light, with a drone flying nearby reading the pattern.

The researchers designed the scheme to underscore vulnerabilities of air-gapped systems, or computers that have been intentionally disconnected from the internet.

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