The accepted answer to this question is now outdated, since Whatsapp web does not require an online smartphone to function anymore. How is the key exchange performed securely?
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I don't have time to write an answer, but here is the whitepaper. The parts on companion devices apply, I believe. – nobody Apr 13 '22 at 22:23
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1“URL signature expired” – AKd Feb 06 '23 at 13:33