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WhatsApp Key Transparency with Jasleen Malvai and Kevin Lewi
Security Cryptography Whatever
How to Use WhatsApp to Authenticate Users
The WhatsApp client is supposed to verify these like Merkel paths. So the client asks for a proof from the directory that WhatsApp servers manage. You could also in the app just type in random phone numbers and see what you get. That kind of already is a problem that we have to deal with. But you can rate limit and exactly.
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