The accepted answer to this question is now outdated, since Whatsapp web does not require an online smartphone to function anymore.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](https://scontent-waw1-1.xx.fbcdn.net/v/t39.8562-6/271639644_1080641699441889_2201546141855802968_n.pdf?_nc_cat=108&ccb=1-5&_nc_sid=ad8a9d&_nc_ohc=pKFueeyg0AwAX-smkyb&_nc_ht=scontent-waw1-1.xx&oh=00_AT9Gqm1l-cdQ5DvltTgsDS-cmc4tBvaPpQv-_aUUwkk7Vg&oe=625A16BD). The parts on companion devices apply, I believe. – nobody Apr 13 '22 at 22:23