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WhatsApp and Signal messages at risk of surveillance following EncroChat ruling, court hears | Computer Weekly
(www.computerweekly.com)
this post was submitted on 28 Jul 2024
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Wonder how they'd manage that as they both are E2EE.
Whatsapp uses the same protocol as signal so MITM is unlikely however there's no way to know what happens before or after the messages are encrypted/decrypted and sent. They can do that scanning at that stage.
Sender cannot know where the recipient is and using P2P would be resource consuming on all client devices (i.e. everyone who uses Signal) so I guess the messages are routed thru Signal's servers though messages are encrypted on device with keys that only the messaging parties know (couldn't find an official diagram for this to confirm).