[xvector]

We have robust cryptographic constructions for channels at this point. One is described in https://www.ietf.org/blog/mls-secure-and-usable-end-to-end-e...

[HL33tibCe7]

If you’d have read the comment you’re replying to, you’d know that “robust cryptographic constructions” are irrelevant here, because channels are publicly-accessible.