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Complexity  ·  4038 days ago  ·  link  ·    ·  parent  ·  post: Meet “badBIOS,” the mysterious Mac and PC malware that jumps airgaps

Here's a Javascript library that provides ultrasonic audio networking in the browser. It's more hobbyist or proof of concept at the moment.

Ultrasonic communications has already made its way into kids' toys ( Furby for example )

Those two are unidirectional but show it's possible. It is a leap from the possibility to using it as a command and control system, but not much of a leap.