Philliam Hallam-Baker posted this to the CFRG recently: https://www.ietf.org/id/draft-hallambaker-mesh-recrypt-00.txt
He's looking for a general, IETF-level solution for multiparty/multi-device encrypted messaging. I think he misses out on some of the prior art (e.g. multiparty Signal protocol) but, in general, I think it's an interesting problem worth solving. -- Tony Arcieri
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