Air-Gapped Devices Can Send Covert Morse Signals via Network Card LEDs

A security researcher who has a long line of work demonstrating novel data exfiltration methods from air-gapped systems has come up with yet another technique that involves sending Morse code signals via LEDs on network interface cards (NICs).
The approach, codenamed ETHERLED, comes from Dr. Mordechai Guri, the head of R&D in the Cyber Security Research Center in the Ben Gurion University of the

air-gapped card covert devices network send