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

Kazuho Oku <> Thu, 31 October 2019 09:11 UTC

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Date: Thu, 31 Oct 2019 02:11:42 -0700
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.

> +issues.  Such design is not recommended, as an active attacker might build a
+list of known alternative version numbers and their initial salts and use that
+list to decrypt the payload of Initial packets using those alternative version
+numbers.  But still, having a set of version numbers and initial salts used
+concurrently is considered better than just using the default values of QUIC in
+terms of preventing ossification.
+A server MUST NOT send a Version Negotitation packet in response to a long
+header packet with an alternative version number it has advertised.
+## Distributing the Seeds
+This specification defines how the seeds are used as well as how they are
+advertised using a NEW_TOKEN frame.  Other specifications MAY define other
+methods for distributing or deducing these seeds.

HTTP/3 defining Alt-Svc, SVCB / HTTPSSVC DNS records, ESNI, to name a few.

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