Flashing LEDs is a possibility too. Like Morse Code, you could flash a dit and a... | Hacker News

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		_wldu on Aug 12, 2016 \| parent \| context \| favorite \| on: Data Exfiltration from Speakerless Air-Gapped Comp... Flashing LEDs is a possibility too. Like Morse Code, you could flash a dit and a dah (1 and 0) to represents bits. More advanced techniques using proper timing and spacing to form letters and words may allow for more data extraction. I bet you could get about 60 characters (bytes) per minute. Maybe more. Would need a smart phone or camera to read it.

Gracana on Aug 12, 2016 [–]

LEDs can be pretty darn quick. My friend was able to use a status LED on his FPGA board as a toslink transmitter.

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