There's already been a lot of research done on acoustic attacks. For example: http://www.inf.ed.ac.uk/publications/thesis/online/IM100855.pdf http://www.inf.ed.

There's already been a lot of research done on acoustic attacks. For example: http://www.inf.ed.ac.uk/publications/thesis/online/IM100855.pdf http://www.inf.ed.ac.uk/publications/thesis/online/IM100855....