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

David Schinazi <> Wed, 11 March 2020 03:16 UTC

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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.

> @@ -4742,6 +4781,22 @@ active_connection_id_limit (0x0e):
   When a zero-length connection ID is being used, the active_connection_id_limit
   parameter MUST NOT be sent.
+handshake_connection_id (0x0f):
+: The value that the endpoint included in the Source Connection ID field of the
+  first Initial packet it sends during the handshake. Endpoints MUST validate
+  that this transport parameter is present and that it matches the value that
+  was received in Initial packets. Authenticating this value ensures that an
+  attacker is unable to influence the selection of connection IDs during the

My read of the zero-length CID case is that the TP MUST be included, and be zero-length. Perhaps we should add a sentence to clarify that.

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