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That's actually painfully simple, crazy even a phone camera could do it and I expect a custom firmware on a SLR would be able to add a mode that just logs the intensity of the central small square of pixels at incredible speed.
I guess people will have to start salting their encode functions with spurious calculations to try and make it a bit harder.
people will have to start salting their encode functions with spurious calculations to try and make it a bit harder.
Yes ... sad and funny. Or make sure the LED's power supply is decoupled from the calculation. I feel adding extra code to security relevant functions might not be such a great idea. If a tiny extra battery does the job, why not.