[Cryptography] "The Visual Microphone: Passive Recovery of Sound from Video"

Christian Huitema huitema at huitema.net
Tue Aug 5 16:35:36 EDT 2014


> The point is that the Nyquist theorem doesn't protect you here.  > It just
makes the attacker's job a bit harder and more expensive.

Yes. Also, even if the signal is hard to understand by humans, it might be
possible to use machine learning and train a recognizer directly on the
output signal...

Computer vision leads to all kind of neat applications like that.
Recognizing faces or reading license plates, obviously. Capturing heartbeat.
Classifying emotions. Finding the origin of a sound by comparing the sound
to vibrations of part of the image. Sound from images. The implications for
security can be interesting!

-- Christian Huitema





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