The flickering from an LED light for a hard disk drive can hijacked to transmit encoded 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.