Re: [quicwg/base-drafts] token-based greasing / initial packet protection (#3166)

Kazuho Oku <> Wed, 30 October 2019 05:25 UTC

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From: Kazuho Oku <>
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Subject: Re: [quicwg/base-drafts] token-based greasing / initial packet protection (#3166)
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kazuho commented on this pull request.

> @@ -2721,6 +2721,66 @@ between endpoints.  Application protocols SHOULD define rules for handling
 streams that are prematurely cancelled by either endpoint.
+# Alternative Initial Set {#alternative-initial}
+In order to avoid ossification of the cleartext and obfuscated fields of QUIC
+packets, a server can announce an alternative set of initial values to be used,
+which is comprised of:
+* Alternative version number; a 32-bit unsigned number that is to be presented
+  on wire in place of the version number specified in this document.  This value
+  MUST NOT be a reserved version ({{versions}}).
+* Packet type modifier; a two-bit value that is to be applied as a bit-wise
+  exclusive or (XOR) to the most significant bits of the Initial, Handshake,
+  0-RTT, and Retry packets. This XOR is applied after the packets are encrypted
+  and before they are decrypted.

Thanks for arguing for that. I had somehow thought that that's impossible, but I do not know why. Addressed in 14469be.

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