The key extraction is not any sort of actual practical attack. It is a pure demonstration of the principle. It is yet another example of the principle that leak

The key extraction is not any sort of actual practical attack. It is a pure demonstration of the principle. It is yet another example of the principle that leaks are leaks and that is is hard to know which ones are important. It strongly suggests that platforms should not transmit anything coupled to the internal operation of the platform. Why are audio systems (this one was Mumble) sending all this junk in the lower bits of the audio samples? Why not zero that out as part of the automatic gain control scheme? The receiver doesn't want to hear it anyway,