Re: [quicwg/base-drafts] Order transport parameters (#3418)

Christian Huitema <notifications@github.com> Wed, 05 February 2020 11:08 UTC

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Subject: Re: [quicwg/base-drafts] Order transport parameters (#3418)
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I assume you mean ordering by TP number. I don't like that, because applications typically refer to parameters by name, not by number. For example, a plausible implementation is to have a structure holding parameters in some logical order, and code that goes through that structure and encode the parameters with only symbolic references to their TP number. Adding a sort makes the code much more complicated.

As for fingerprinting, I am not sure you can beat it with just reordering. Reordering drops the space from N! to N^2, that's better but not sufficient. The "sufficient" answer would be to create "anonymity sets", i.e. a small set of combined "profiles" specifying values or absence for all TP. 

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