They can use the loudspeakers as microphone. Usenix 2017: Turn Speakers to Microphones for Fun and Profit https://www.usenix.org/system/files/conference/woot17

They can use the loudspeakers as microphone. Usenix 2017: Turn Speakers to Microphones for Fun and Profit https://www.usenix.org/system/files/conference/woot17/woot17-paper-guri.pdf https://www.usenix.org/system/files/conference/woot17/woot17...