No. I wrote about this a couple of years ago (https://mjg59.dreamwidth.org/62598.html https://mjg59.dreamwidth.org/62598.html) and the answer is that while Sign

No. I wrote about this a couple of years ago (https://mjg59.dreamwidth.org/62598.html https://mjg59.dreamwidth.org/62598.html) and the answer is that while Signal solves the cryptography problem, the other hard problem (ie, everything to do with key management) is still up to whatever's on top of the Signal protocol.