Re: [quicwg/base-drafts] Use the same KDF regardless of TLS version (#2034)

Kazuho Oku <notifications@github.com> Wed, 21 November 2018 06:55 UTC

Return-Path: <noreply@github.com>
X-Original-To: quic-issues@ietfa.amsl.com
Delivered-To: quic-issues@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4C6A7128766 for <quic-issues@ietfa.amsl.com>; Tue, 20 Nov 2018 22:55:54 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -8.47
X-Spam-Level:
X-Spam-Status: No, score=-8.47 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.47, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, MAILING_LIST_MULTI=-1, RCVD_IN_DNSWL_HI=-5, SPF_PASS=-0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=github.com
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id zEY-g0zFb8C0 for <quic-issues@ietfa.amsl.com>; Tue, 20 Nov 2018 22:55:52 -0800 (PST)
Received: from out-1.smtp.github.com (out-1.smtp.github.com [192.30.252.192]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 5DA8E130E0A for <quic-issues@ietf.org>; Tue, 20 Nov 2018 22:55:52 -0800 (PST)
Date: Tue, 20 Nov 2018 22:55:51 -0800
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=github.com; s=pf2014; t=1542783351; bh=JMscNZjfg1RIyLWhhhZboq7T66FoXSd9RvmhonpYxWw=; h=Date:From:Reply-To:To:Cc:In-Reply-To:References:Subject:List-ID: List-Archive:List-Post:List-Unsubscribe:From; b=sSI21PdVlgSc7Xtj3L9cVxO4bfhKKYuV3jc1LSPlLd1p252bpG/0qKfgzTX9omlQO VFx6aafF5ZxYog+RMktKk3yyFFEWDHx/P92PVdptMGAwpoFa4S64ySr89R69wMt2CJ GcSowM/MUwJkUfeL9WfPjFxI97KDpVI0bkLPPgoY=
From: Kazuho Oku <notifications@github.com>
Reply-To: quicwg/base-drafts <reply+0166e4ab5a912405f9ae80c0d48b363b84ec596a72ddd0c492cf00000001180cc37792a169ce16d3c410@reply.github.com>
To: quicwg/base-drafts <base-drafts@noreply.github.com>
Cc: Subscribed <subscribed@noreply.github.com>
Message-ID: <quicwg/base-drafts/pull/2034/c440558005@github.com>
In-Reply-To: <quicwg/base-drafts/pull/2034@github.com>
References: <quicwg/base-drafts/pull/2034@github.com>
Subject: Re: [quicwg/base-drafts] Use the same KDF regardless of TLS version (#2034)
Mime-Version: 1.0
Content-Type: multipart/alternative; boundary="--==_mimepart_5bf50177305c3_5d63fda254d45c4726a7"; charset="UTF-8"
Content-Transfer-Encoding: 7bit
Precedence: list
X-GitHub-Sender: kazuho
X-GitHub-Recipient: quic-issues
X-GitHub-Reason: subscribed
X-Auto-Response-Suppress: All
X-GitHub-Recipient-Address: quic-issues@ietf.org
Archived-At: <https://mailarchive.ietf.org/arch/msg/quic-issues/A7a8nrADNsCiZ8XIrU9Ch_E71s4>
X-BeenThere: quic-issues@ietf.org
X-Mailman-Version: 2.1.29
List-Id: Notification list for GitHub issues related to the QUIC WG <quic-issues.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/quic-issues>, <mailto:quic-issues-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/quic-issues/>
List-Post: <mailto:quic-issues@ietf.org>
List-Help: <mailto:quic-issues-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/quic-issues>, <mailto:quic-issues-request@ietf.org?subject=subscribe>
X-List-Received-Date: Wed, 21 Nov 2018 06:55:54 -0000

Is the suggestion here to use the HKDF function defined in TLS 1.3 for Handshake, 0-RTT, 1-RTT packets even when the negotiated version is TLS 1.4?

I am not sure if that is a good idea, because there could be an "improvement" to the HKDF function in TLS 1.4. IMO, the use of the HKDF function of TLS 1.3 should be limited to Initial packets.

-- 
You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
https://github.com/quicwg/base-drafts/pull/2034#issuecomment-440558005