Re: [quicwg/base-drafts] introduce a version alias mechanism (#2573)

["Philipp S. Tiesel" <[e-mail]>]

philsbln commented on this pull request.



> @@ -3246,7 +3246,21 @@ Implementors are encouraged to register version numbers of QUIC that they are
 using for private experimentation on the GitHub wiki at
 \<https://github.com/quicwg/base-drafts/wiki/QUIC-Versions\>.
 
-
+## Version Aliases
+
+In order to avoid ossification of the version number defined by this draft,
+servers announce a list of version numbers that they interpret as an alias for
+the version number used in this draft. Alias versions MUST NOT be a reserved
+version. Servers SHOULD send at least one version alias, and SHOULD frequently
+change the value that they announce. Each version alias contains a lifetime,
+which indicates how long the server will accept this version alias. It also
+contains an initial salt, which is used instead of the initial salt as defined

Even without the salt, the presence of multiple QUIC versions with different salts would force a middle-box to opportunistically decrypt initials using different salts. So if we decide QUIC being blocked because of too much obfuscation is a consideration, this proposal adds to this level even without a salt.

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