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