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I recently learned that LEDs can be used as light sensors if connected to an ADC. I wonder what other mechanisms there might be to capture sound that a determin
by askvictor 8y ago
I recently learned that LEDs can be used as light sensors if connected to an ADC. I wonder what other mechanisms there might be to capture sound that a determined adversary (i.e. government organisation) might use. While speakers can certainly be used as microphones, I doubt they'd be connected to an ADC so probably won't be useful, but what about the multitude of other sensors?
- wongarsu 8y ago> While speakers can certainly be used as microphones, I doubt they'd be connected to an ADC so probably won't be useful In most modern PCs with two audio jacks software will ask you what kind of device you just connected and reconfigure the sound chip to treat it as input or output. I wouldn't be surprised if clever software was able to convince Apple hardware to treat the built in speaker as a microphone.
- jloughry 8y agoThat hardware capability is exploited in the following paper, if you want to know the details: Mordechai Guri et al. (2016) 'SPEAKE(a)R: Turn Speakers to Microphones for Fun and Profit'. http://cyber.bgu.ac.il/advanced-cyber/system/files/SPEAKE(a)R.pdf http://cyber.bgu.ac.il/advanced-cyber/system/files/SPEAKE(a)... By Mordechai Guri, Yosef Solewicz, Andrey Daidakulov, and Yuval Elovici.
- Sephr 8y agoI'm getting access denied on that link. Do you have a mirror?
- antoinealb 8y agoI was able to read it on Arxiv: https://arxiv.org/pdf/1611.07350.pdf https://arxiv.org/pdf/1611.07350.pdf