Re: [TLS] WGLC for draft-ietf-tls-cached-info-19

Martin Thomson <martin.thomson@gmail.com> Tue, 15 September 2015 23:10 UTC

Return-Path: <martin.thomson@gmail.com>
X-Original-To: tls@ietfa.amsl.com
Delivered-To: tls@ietfa.amsl.com
Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D84021B2DB1 for <tls@ietfa.amsl.com>; Tue, 15 Sep 2015 16:10:54 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2
X-Spam-Level:
X-Spam-Status: No, score=-2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, SPF_PASS=-0.001] autolearn=ham
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 k1AjuiMJQm5a for <tls@ietfa.amsl.com>; Tue, 15 Sep 2015 16:10:53 -0700 (PDT)
Received: from mail-yk0-x232.google.com (mail-yk0-x232.google.com [IPv6:2607:f8b0:4002:c07::232]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id AD52B1B2DB3 for <tls@ietf.org>; Tue, 15 Sep 2015 16:10:53 -0700 (PDT)
Received: by ykdu9 with SMTP id u9so203032133ykd.2 for <tls@ietf.org>; Tue, 15 Sep 2015 16:10:53 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; bh=6HM4aA4j0wsvMYjtDj0rGjU6jEqrPGx5AVcq3wXTU3I=; b=A8pGr2VCNziAg7UBfhDdW/YhHYKVr7fG3o8Gf3g/yF5p87EHH6y5B6W++UFrrF2S/z MfHEU1SqbDnw3ip04QX4vgLGyyEzY1dpRh3slNVHiMJPKrg03GQ75oFuw2awgGm8Z1dL DaRyNuaj5GrMqKwHyRHpGQFkAinv2P9sU/qUJ3Nm9yOQrEPy7hHqb3UokJvijKyjNiCU IJ4mq49V252t+1P5JAAN0GgO/DfqMVR2+vP58blLok5vtuyo1YpP+K8nRzXwX9zYyk1M jjL4UQYcFOCpwjaFovN/CvnBVnPbmMXKqgdBPhtxZjG3AJXGjdMH1q/dakQum+GkZ4Nb 9Gew==
MIME-Version: 1.0
X-Received: by 10.170.78.65 with SMTP id u62mr21971107yku.118.1442358652920; Tue, 15 Sep 2015 16:10:52 -0700 (PDT)
Received: by 10.129.133.130 with HTTP; Tue, 15 Sep 2015 16:10:52 -0700 (PDT)
In-Reply-To: <CABkgnnWTN7bR+jGbSirpqgwa3o+juCBJ60ea=z2jYffnwm7o0w@mail.gmail.com>
References: <CAOgPGoBivgXGKpZH=4mSkrVaKyg9YPi05rphs3VOcvuiFfPzrg@mail.gmail.com> <CABkgnnU++z-r3m2p-+k-6i8BwE5o9wXULS0RVJfCG1+nmkY13Q@mail.gmail.com> <55DB489C.80505@gmx.net> <CABkgnnWXsieUibqFwa_ugm==Vw+5zYpkH6nersxJVvURqf475A@mail.gmail.com> <55F1662C.5050209@gmx.net> <CABkgnnU_r=CmNuaX8kOoxYPoBJ052=4Df88yLb5xxVp4zgRjGw@mail.gmail.com> <CABcZeBP-xGLkMDewK47AVPGqdvzoamQ8R+dj+1=HXF2u-GDMSA@mail.gmail.com> <CABkgnnWTN7bR+jGbSirpqgwa3o+juCBJ60ea=z2jYffnwm7o0w@mail.gmail.com>
Date: Tue, 15 Sep 2015 16:10:52 -0700
Message-ID: <CABkgnnWgZH_RQr8GLOr=P8EzL+CL=pQcOHTOGFymPguGj8KOHg@mail.gmail.com>
From: Martin Thomson <martin.thomson@gmail.com>
To: Eric Rescorla <ekr@rtfm.com>
Content-Type: text/plain; charset=UTF-8
Archived-At: <http://mailarchive.ietf.org/arch/msg/tls/kh4PcZ32PyfY8d0B8_-QkuxAUvs>
Cc: "tls@ietf.org" <tls@ietf.org>
Subject: Re: [TLS] WGLC for draft-ietf-tls-cached-info-19
X-BeenThere: tls@ietf.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: "This is the mailing list for the Transport Layer Security working group of the IETF." <tls.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/tls>, <mailto:tls-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/tls/>
List-Post: <mailto:tls@ietf.org>
List-Help: <mailto:tls-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/tls>, <mailto:tls-request@ietf.org?subject=subscribe>
X-List-Received-Date: Tue, 15 Sep 2015 23:10:55 -0000

On 15 September 2015 at 14:49, Martin Thomson <martin.thomson@gmail.com> wrote:
> Do you have a security analysis that
>> demonstrates
>> that that's the case?
>
> Do you want one?  I guess that I could adapt one of the existing 1.3
> models to remove the certificate (and assume some out-of-band
> mechanism for moving the certificate around).

Sam just ran the analysis.  The TLS 1.3 proofs they have work without
Certificate in the transcript, which is equivalent to a zero-bit
truncated hash.