It never occurred to me that the audio chips could be software adjusted to make the headphone jack a microphone jack. I have used a speaker as a microphone before, so that part is not news, but this ups the game a bit. https://www.usenix.org/system/files/conference/woot17/woot17-paper-guri.pdf <https://www.usenix.org/system/files/conference/woot17/woot17-paper-guri.pdf>
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