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this post was submitted on 09 Oct 2023
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Privacy
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They only recently made it quantum resistant, so I don't think that whatsapp is using that version
Problem is that they can still compromise it. Simplest method would be to just take what you've typed into the UI and send it two times. One time to your communication partners and one time unencrypted / decryptable for themselves.
But even if they're exclusively sending via Signal's library and not tampering with it or anything, they can still instruct Signal's library to add another member to a group chat. And that 'member' can be their server. It will be sent, fully end-to-end-encrypted, but to an end you don't know about.