The spec is pretty intense, I think the first thing to work on is better high level documentation and overview. There is a lot going on with how this proposed system formats, encrypts, signs, routes, and validates.<p>I've only glanced over less than half of the spec so far, but I'm not convinced of the design just yet. For starters, I'm not sure I fully understand the trust model, or even the baseline limitations on things like one-to-many emails, key exchange, PFS. Before jumping straight into packet formats and field layouts, I want to read more about the basic operational model.