« By transmitting data from a computer’s hard drive LED with a kind of morse-code-like patterns of on and off signals, the researchers found they could move data as fast as 4,000 bits a second, or close to a megabyte every half hour. That may not sound like much, but it’s fast enough to steal an encryption key in seconds ».

Source : Watch Malware Steal Data From Air Gapped PC With Blinking Lights and a Drone | WIRED