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Re: [quicwg/base-drafts] QUIC Version Ossification (#2496)

Christian Huitema <notifications@github.com> Thu, 23 May 2019 10:20 UTC

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From: Christian Huitema <notifications@github.com>
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Subject: Re: [quicwg/base-drafts] QUIC Version Ossification (#2496)
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I am trying to summarize the set of version obfuscation proposals. I believe we have:

1) Natural versions. Just define a version 2, maybe 1bis, very quickly, and actually use version negotiation.

2) Server specific version aliases,as specified in #2573

3) Version based obfuscation and trial decryption, as proposed by David Benjamin and explained on this thread

4) Introduce a "QUIC Version" TLS extension, sent either in the clear or passed as an encrypted extension to the ESNI content.

There are pros and cons to each of those:

proposal | Pros | Cons 
--- | --- | ---
Natural version | Very little code required | Still risk of ossification
Server defined aliases | Robust prevention | Does not protect 1st packet; Requires caching code; May enable tracing
Version based obfuscation | Robust prevention | Requires trial decryption
TLS extension | Can be encrypted | Requires ESNI


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