I don't understand your question. See https://signal.org/blog/sealed-sender/ https://signal.org/blog/sealed-sender/ and https://eprint.iacr.org/2019/1416 https

I don't understand your question. See https://signal.org/blog/sealed-sender/ https://signal.org/blog/sealed-sender/ and https://eprint.iacr.org/2019/1416 https://eprint.iacr.org/2019/1416 if you'd like descriptions for the protocols I'm trying to describe in HN comments.