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Of course somebody did this...
nitter.eu/mlsec/status/1469374

"""
Did you know that a normal LED can also receive light? 🚨

It can! In this paper, we point a laser at build-in LEDs of offices devices and transmit data to their firmware. This covert communication can bridge 25m with a throughput of 128 kbps.
"""

Full paper:
intellisec.de/pubs/2021-acsac.

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