Re: [quicwg/base-drafts] Authenticate connection IDs (#3499)

David Schinazi <> Sat, 09 May 2020 00:52 UTC

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Date: Fri, 08 May 2020 17:52:42 -0700
From: David Schinazi <>
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Subject: Re: [quicwg/base-drafts] Authenticate connection IDs (#3499)
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@DavidSchinazi commented on this pull request.

> @@ -1475,6 +1475,49 @@ lifetime of a connection, especially in response to connection migration
 ({{migration}}); see {{issue-cid}} for details.
+## Authenticating Connection IDs {#cid-auth}
+The choice each endpoint makes about connection IDs during the handshake is
+authenticated by including all values in transport parameters; see
+{{transport-parameters}}. This ensures that all connection IDs used for the
+handshake are also authenticated by the cryptographic handshake.
+Each endpoint includes the value of the Source Connection ID field from the most
+recent Initial packet it sent in the initial_connection_id transport
+parameter; see {{transport-parameter-definitions}}. A server includes the
+Destination Connection ID field it receives in original Initial packets from the

`original_connection_id` used to only apply when a Retry was involved. This PR changes that: servers now always send `original_connection_id` no matter what.

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