
One of our favorite hardware hackers, Joe Grand, has shared slides and hardware designs from his recent B-Sides PDX talk:
Data exfiltration from a device is usually achieved over the network, via hardware implant, or by manipulating the characteristics of an internal electronic component. Optical covert channels transmit data using visible light in a method undetectable to the human eye.
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Joe demonstrates using an optical receiver to capture data transmitted through a LED:
joegrand has shared the receiver boards on OSH Park:
digital version using Everlight PLR135/T9 Fiber Optic Receiver


analog version based on Maxim Integrated’s AN1117 application note:

