Zoom uses the SILK codec, Constant Bit Rate (after some bandwidth negotiation); as others have pointed out audio and video noise both fight ECBs weaknesses. It’s actually more secure on the wire than many conferencing systems I’ve looked at.https://twitter.com/colmmacc/status/1246160773379796994 …
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This is all encapsulated in RTP; it seems like surely there must be something you could key off in the RTP header.
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(but like: I generally sort of agree that this is what happened; like, getting a real cipher construction in here would have taken actual crypto engineering, and they did the one thing you can just drop in)
End of conversation
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