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Signal protocol refers to a cryptographic protocol not a messaging protocol. XMPP also has an Signal protocol implementation called OMEMO.

Only for two-way chat, plus the default is still not encrypted (using Signal protocol) for WhatsApp.

In short, data-at-rest still can remains unencrypted for majority of the messagings on the WhatsApp’s server for all those who may be interested in them … UNLESS you enabled Signal/Encrypted option for two-way.

Group chat for WhatsApp?, it’s still the proverbial pants’ down.

No. All communications in WhatsApp are encrypted end to end, whether between 2 persons, or inside a group [1].

I believe you are referring to Telegram which does not use encryption by default.

[1] https://www.whatsapp.com/security/WhatsApp-Security-Whitepap...

I must be having a brain fart moment. Make that Telegram.

My bad.

Signal as in the chat platform? Fantastic if so.