Re: [TLS] Data volume limits

Eric Rescorla <ekr@rtfm.com> Tue, 15 December 2015 21:16 UTC

Return-Path: <ekr@rtfm.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 E33D11ACE70 for <tls@ietfa.amsl.com>; Tue, 15 Dec 2015 13:16:14 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.277
X-Spam-Level:
X-Spam-Status: No, score=-1.277 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001] autolearn=no
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 kCi2OezFx3c2 for <tls@ietfa.amsl.com>; Tue, 15 Dec 2015 13:16:14 -0800 (PST)
Received: from mail-qk0-x236.google.com (mail-qk0-x236.google.com [IPv6:2607:f8b0:400d:c09::236]) (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 C8DCF1ACE6E for <tls@ietf.org>; Tue, 15 Dec 2015 13:16:13 -0800 (PST)
Received: by mail-qk0-x236.google.com with SMTP id k189so34531765qkc.0 for <tls@ietf.org>; Tue, 15 Dec 2015 13:16:13 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rtfm-com.20150623.gappssmtp.com; s=20150623; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :content-type; bh=feeOhk/FvSRcV8uv8bIl75sIWfV1CeBc2hYMCQaVzrk=; b=rqTwYrwijraXvAenmF6oN7CQOXySK0OY4Rd+cwrKSl4iq+Qbd0CIhCohNbasNCI8O2 f/FXNgE4zs6VbkHx+lTVDggwMkte69BQT0W2gN0jcp1tmtXvUXRqqKoHfa5Zx1oE/UHC N4ZPLg4LW5UBS0iqQdCzsierqqwblbv0NPsuGhJ0ugwmrZXYArLyC7zYOX6KtHWAE1xT 8B6rF+Vm87E7/yYstqK/Ee9JTuvCYQNla4N8ry+EVe5DYOiPBwfQJHhzI3qNI7agkY3w WwAUb8LM3/hpr0mPzXjQJ6RelXDNqvGzkq5eBpQYCApbvvHGgOZEa9Soj/3q+283VGC3 /zGw==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:content-type; bh=feeOhk/FvSRcV8uv8bIl75sIWfV1CeBc2hYMCQaVzrk=; b=I4gK9RVpeYg27Kgxz47dvTCZC11DmizDTv2s/9Qu8CXvAAgZMYw/1uC6yQLgtuWzN9 XeI0/sCfcvQy2pWlW+lo0GEbVaGWLCs6IuMktyx4qNgqyFsYy+KPIDcfdop8+qw6TF/V hf/PVlbsYt7DsyNmd5T9XxeRvGcVTSYygUzJzdgKd1Sg79cDm74MhHRkpwg/CKISSxcQ rvG7vUy8I9LVJ+C0kGmbEHOm3xx+/ueQf9Bc0MQyfxUkk5ndxuzVzETxdygVmJCGgxVW +oNwpeUrNQBwnVOqdvnQ9Cjutf7gBiHXU7FiJPzHkxb/wqGUi5AjTLk18d3ZYs8tpVpd O/dg==
X-Gm-Message-State: ALoCoQmTCYlbfRk67I+QWSBUk/TFcCAtDTxKuVyClYRyE8fUIHQ/meGENCsdg3Pi81mOEhyNRjiNt0f71xBba58HwcNgclffuQ==
X-Received: by 10.129.79.87 with SMTP id d84mr16917132ywb.115.1450214172988; Tue, 15 Dec 2015 13:16:12 -0800 (PST)
MIME-Version: 1.0
Received: by 10.13.249.197 with HTTP; Tue, 15 Dec 2015 13:15:33 -0800 (PST)
In-Reply-To: <CABcZeBNR76DqPo0Mukf5L2G-WBSC+RCZKhVGqBZq=tJYfEHLUg@mail.gmail.com>
References: <CABcZeBNR76DqPo0Mukf5L2G-WBSC+RCZKhVGqBZq=tJYfEHLUg@mail.gmail.com>
From: Eric Rescorla <ekr@rtfm.com>
Date: Tue, 15 Dec 2015 13:15:33 -0800
Message-ID: <CABcZeBO5uDV=d=5uDUz5kJwGcycJmZx9FwqyWno-6RHR+jjiKw@mail.gmail.com>
To: "tls@ietf.org" <tls@ietf.org>
Content-Type: multipart/alternative; boundary=001a114dc360a1464e0526f64cdf
Archived-At: <http://mailarchive.ietf.org/arch/msg/tls/JiBXycs_ednmOLxa4C05cUzubCo>
Subject: Re: [TLS] Data volume limits
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 Dec 2015 21:16:15 -0000

For context, see:
https://github.com/tlswg/tls13-spec/pull/372

On Tue, Dec 15, 2015 at 1:14 PM, Eric Rescorla <ekr@rtfm.com> wrote:

> Watson kindly prepared some text that described the limits on what's safe
> for AES-GCM and restricting all algorithms with TLS 1.3 to that lower
> limit (2^{36} bytes), even though ChaCha doesn't have the same
> restriction.
>
> I wanted to get people's opinions on whether that's actually what we want
> or whether we should (as is my instinct) allow people to use ChaCha
> for longer periods.
>
> -Ekr
>
>