Responding to Hosnieh: We have to avoid loaded terms like minimal changes. What is a minimal change is a very subjective question.
We have middlebox issues. Since a middlebox can't do anything useful to an encrypted message and because my objective is to bypass government censorship schemes, my approach is to bypass the middleboxen wherever possible. So I see no value in port 53 whether UDP or TCP. Changing the port number isn't really a major change in the protocol in my view. Sure we could tunnel e-DNS over DNS. In fact I started off doing that three years ago. I even wrote code for that. But why bother when there are plenty of uncluttered UDP ports?
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