SPEAKE(a)R: Turn Speakers to Microphones for Fun and Profit

(by Mordechai Guri, Yosef Solewicz, Andrey Daidakulov, Yuval Elovici)

Full Paper: http://cyber.bgu.ac.il/advanced-cyber/system/files/SPEAKEaR.pdf

Or https://arxiv.org/abs/1611.07350

Video: https://www.youtube.com/watch?v=ez3o8aIZCDM