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If the people from Signal start a conversation with you on the number you emailed, how do you know it’s actually them? Couldn’t it be a third party who intercepted your email?

You need to check their “safety number”, and now we’re back to the same idea as with PGP with web of trust and key sharing parties.

At some point you still need some kind of pub-key identity check if you don’t want to accidentally report your vulnerability to PRC instead.




Right, that's insecure. Maybe they should, you know, put a PGP key on their website? :)




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