Ever wondered how silent audio could be used to transmit data?
The guys on /r/AskEngineers break down google’s tone technology.
Didn’t stuxnet do this?
Edit: I want to say I’ve heard of this technique being used, can’t for the life of me remember where.
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This was the thing from (fairly) recent history that popped into my mind as “similar”…
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Captain Crunch wants to know your location