12/24/2022 0 Comments How does whatsapp work"So what security properties does the group chat protocol feature and how does it work (at a high level)?"Īs to how it works, I think that paper is as much detail as you'll find available for now until someone else does a full (applied) analysis.įorward secrecy: the ratchet mechanism described provides this (or so they claim) It's a clever adaptation which builds on top of the one-to-one protocol: use it to distribute a shared key to each individual member of the group, so then the group can use the server in order to provide efficient "fan-out" (as well as blob storage) without the server being privy to the required private keys. I would say the key point here is number 4: The sender individually encrypts the Sender Key to each member of the group, using the pairwise messaging protocol explained previously Whenever a group member leaves, all group participants clear their Ratchet” of the message sender’s Chain Key provides forward secrecy.
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