Re: [quicwg/base-drafts] Migration with zero-length CID is inadvisable (#3563)

Mike Bishop <> Wed, 01 April 2020 19:58 UTC

Return-Path: <>
Received: from localhost (localhost []) by (Postfix) with ESMTP id 93B853A188B for <>; Wed, 1 Apr 2020 12:58:56 -0700 (PDT)
X-Virus-Scanned: amavisd-new at
X-Spam-Flag: NO
X-Spam-Score: -1.554
X-Spam-Status: No, score=-1.554 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_IMAGE_ONLY_20=1.546, HTML_MESSAGE=0.001, MAILING_LIST_MULTI=-1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no
Authentication-Results: (amavisd-new); dkim=pass (1024-bit key)
Received: from ([]) by localhost ( []) (amavisd-new, port 10024) with ESMTP id w8BySwPpJ248 for <>; Wed, 1 Apr 2020 12:58:54 -0700 (PDT)
Received: from ( []) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by (Postfix) with ESMTPS id 85BC83A188D for <>; Wed, 1 Apr 2020 12:58:54 -0700 (PDT)
Received: from ( []) by (Postfix) with ESMTP id ECA08120308 for <>; Wed, 1 Apr 2020 12:58:53 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;; s=pf2014; t=1585771134; bh=chNt2XIu93DGS3fv/a76jIpFSLOsQBOF1F4Od5yU0I8=; h=Date:From:Reply-To:To:Cc:In-Reply-To:References:Subject:List-ID: List-Archive:List-Post:List-Unsubscribe:From; b=qGxPfn2I4b+Ww9SRt4Fub13DxDxTpHD4ZrhdWvWs9sh3lgYMWkOMotarBW8xX3RLO LgrwYESrBxKU45ybiZO4VQ01V9Yle7bMWC2bRKCtIMmR1asaoplHB0b4+/vaVy8t0W aVfIFZrOiKwWG/TnIiiDDEPLDPXecBvLW09wgiDk=
Date: Wed, 01 Apr 2020 12:58:53 -0700
From: Mike Bishop <>
Reply-To: quicwg/base-drafts <>
To: quicwg/base-drafts <>
Cc: Subscribed <>
Message-ID: <quicwg/base-drafts/pull/3563/>
In-Reply-To: <quicwg/base-drafts/pull/>
References: <quicwg/base-drafts/pull/>
Subject: Re: [quicwg/base-drafts] Migration with zero-length CID is inadvisable (#3563)
Mime-Version: 1.0
Content-Type: multipart/alternative; boundary="--==_mimepart_5e84f27da6c0e_510f3fd508ccd9642441ee"; charset="UTF-8"
Content-Transfer-Encoding: 7bit
Precedence: list
X-GitHub-Sender: MikeBishop
X-GitHub-Recipient: quic-issues
X-GitHub-Reason: subscribed
X-Auto-Response-Suppress: All
Archived-At: <>
X-Mailman-Version: 2.1.29
List-Id: Notification list for GitHub issues related to the QUIC WG <>
List-Unsubscribe: <>, <>
List-Archive: <>
List-Post: <>
List-Help: <>
List-Subscribe: <>, <>
X-List-Received-Date: Wed, 01 Apr 2020 19:58:57 -0000

@DavidSchinazi, the issue is that, while the server might be confident it will work (and therefore not set the TP), the only way it works is by being highly linkable.  If we think linkability is a bad thing, advising clients not to do it isn't unreasonable.

Of course, servers have other ways of making a connection linkable by observers if they choose to do so, and clients can't detect all of them.  I'm not sure this warrants normative force; I'd simply mention that clients who intend to minimize linkability might want to consider that they're definitely linkable in this situation and could choose to avoid it.

You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub: