Re:Signal can now be used without Google Play Services
by Arathorn on Tuesday February 21, 2017 @09:14AM
(#13695563)
E2E /is/ part of the Matrix protocol - it's just still in beta. The spec PRs haven't landed yet (http://matrix.org/speculator/spec/drafts%252Fe2e/client_serv...). Once out of beta it'll be turned on everywhere by default.
I also seem to remember going over their homebrewed cryptographic rachet and it didn't properly HMAC.
EDIT: Apparently riot.im supports E2E, but it's not a part of the Matrix protocol and it's not encrypted by default. The Olm rachet was also audited by NCC, so that's nice.