[quicwg/base-drafts] token-based greasing (#3166)

[Kazuho Oku <[e-mail]>]

Based on the discussion in #3111, this PR implements greasing using the NEW_TOKEN frame as the conveyor.

It defines defines three properties: Alternative Version Number, Packet Type Modifier, Initial Salt, for obfuscating the version number field and the long header packet type, as well as encrypting the Initial packet payload.

Those three properties are carried by a NEW_TOKEN frame, and a client uses those "alternative initial sets" when resuming a connection using a NEW_TOKEN token. A server that is not interested in greasing or encrypting the Initial packets can advertise the values defined in the specification as the "alternative initial sets," and the client behavior would be the same as it is now (with the only difference being that the format of NEW_TOKEN frame has changed).

Closes #2496, closes #3111, an alternative to #2573.
You can view, comment on, or merge this pull request online at:

  https://github.com/quicwg/base-drafts/pull/3166

-- Commit Summary --

  * first cut

-- File Changes --

    M draft-ietf-quic-transport.md (81)

-- Patch Links --

https://github.com/quicwg/base-drafts/pull/3166.patch
https://github.com/quicwg/base-drafts/pull/3166.diff

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