Keychat on Nostr: WhatsApp uses the Sender Key group model, which supports more group members compared ...

WhatsApp uses the Sender Key group model, which supports more group members compared to the pair-wise group model previously used by Signal.

The new group chat protocol, MLS (Message Layer Security), can support even more group members than the Sender Key group model and offers better encryption security.

If you're interested in various encrypted group chat methods, you can check out the comparison note below.

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Group chats with end-to-end encryption can be designed in many ways, each tailored for a specific number of participants and level of security.

If we regard the security of one-on-one chats in Keychat as perfect, scoring 100, and the security of large group chats without end-to-end encryption as nonexistent, scoring 0, we can map out where the five identified end-to-end encryption group chat models fall in terms of group size and security on a diagram as shown below: