"The fact that headphones, earphones, and speakers are physically built like microphones, and that an audio port's role in the PC can be reprogrammed from output to input, creates a vulnerability that can be abused by hackers," says Prof. Yuval Elovici, director of the BGU Cyber Security Research Center (CSRC) and member of BGU's Department of Information Systems Engineering. "This is the reason people, like Facebook Chairman and Chief Executive Officer, Mark Zuckerberg, tape up their mic and webcam," says Mordechai Guri, lead researcher and head of Research and Development at the CSRC. "You might tape the mic, but it would be unlikely to tape the headphones or speakers."SPEAKE(a)R shows off how a determined hacker can repurpose the tech inside the speakers in your computer to turn it into voice-recording devices, without you knowing. What makes it even scarier, is that this works even when the speakers on your computer have been disabled or, even, completely removed. The speakers in your headphones turn electromagnetic signals into sound through a membrane's vibrations. This membrane can be reverse-engineered to record sound instead of just playing it.