With message signing on the horizon to provide confidence, it is expected that many will desire the next step: encrypted messaging to provide confidentiality. It is not expected we can have confidentiality in Havana, but we will need to plan for it in our changes to rpc envelope, matchmaker, etc.
With message envelopes introduced in Grizzly and to be enabled with Havana, we have the ability to make the envelope immutable. I am proposing a blueprint to work toward immutable messaging and would like to discuss the challenges of achieving this goal and the requirements for the next version of the RPC envelope.
