https://www.usenix.org/system/files/conference/woot17/woot17-paper-guri.pdf
Article
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Research shows PC speakers can be repurposed as microphones for covert audio capture.
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Exploits jack retasking in audio hardware to record even with mic disabled.
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Demonstrates audio exfiltration from air-gapped machines via speakers.
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Attack requires malware on the target machine to retask audio output.
Discussion
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antirez notes many physical processes are invertible: motors, LEDs, Peltier cells, speakers.
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Commenters share personal anecdotes: fishing boats using deck speakers as intercoms, recording via headphones as kids.
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Drive-thru kiosks confirmed to use this same speaker-as-mic principle commercially.
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One commenter found a hidden wired speaker under a DC hotel bathroom sink labeled ‘F.B.I.’
Discuss on HN