Thursday night was a real treat. I got to see both Joe Grand and Kitty Yeung at the HDDG meetup, each speaking about their recent work. Joe walked us through the OpticSpy, his newest hardware product that had its genesis in some of the earliest days of data leakage. Remember those lights on old modems…

via Joe Grand is Hiding Data in Plain Sight: LEDs that Look Solid but Send a Message — Hackaday