IETF Logo Mail Archive

Re: [TLS] Security review of TLS1.3 0-RTT

"Salz, Rich" <rsalz@akamai.com> Wed, 03 May 2017 15:33 UTC

Return-Path: <rsalz@akamai.com>
X-Original-To: tls@ietfa.amsl.com
Delivered-To: tls@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 98D0A127A91 for <tls@ietfa.amsl.com>; Wed, 3 May 2017 08:33:36 -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, HTML_MESSAGE=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=akamai.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 DJBqeQ3_KeaE for <tls@ietfa.amsl.com>; Wed, 3 May 2017 08:33:34 -0700 (PDT)
Received: from mx0b-00190b01.pphosted.com (mx0b-00190b01.pphosted.com [IPv6:2620:100:9005:57f::1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 00964129B88 for <tls@ietf.org>; Wed, 3 May 2017 08:31:04 -0700 (PDT)
Received: from pps.filterd (m0050102.ppops.net [127.0.0.1]) by m0050102.ppops.net-00190b01. (8.16.0.21/8.16.0.21) with SMTP id v43FQmnR016245; Wed, 3 May 2017 16:31:03 +0100
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=akamai.com; h=from : to : subject : date : message-id : references : in-reply-to : content-type : mime-version; s=jan2016.eng; bh=01jURIaDFlVxXPz194Duhnbz8Lkyw1UU+bO0pHjrX48=; b=kyKXzvWN4FmC8RpmjfD2GL6QZlt9McYv73pr+I2t4LWU/8GuLZVn9ROFmaRZPLbv2g4X zbi70L5qcsMmHSoHJjLHUDaf/49EFc9rpcXpi9KdvSmReLXb1NJfgHZ18VED2PbuP7tJ bzr3TN0WiWHwEU90ChDgJBcVefZiC9gSgnIVvnUTE6b4pdQVKmSrX6m2yJExOOcH6vUY AoVu5dMmSroxyyTovQMaj1PzCPG4Bn/M+34XcFhmehwNdOLsdQRAeCTPFDXXc4AhKQQn kJSWpCMUxg5XKydY5+msSRIUqsJb0yQLAu8DZopfw+xlifUT7JxlfcmI4BTlG5XPpidk lA==
Received: from prod-mail-ppoint2 (a184-51-33-19.deploy.static.akamaitechnologies.com [184.51.33.19] (may be forged)) by m0050102.ppops.net-00190b01. with ESMTP id 2a72my3wqw-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 03 May 2017 16:31:03 +0100
Received: from pps.filterd (prod-mail-ppoint2.akamai.com [127.0.0.1]) by prod-mail-ppoint2.akamai.com (8.16.0.17/8.16.0.17) with SMTP id v43FPirt006499; Wed, 3 May 2017 11:31:02 -0400
Received: from email.msg.corp.akamai.com ([172.27.25.34]) by prod-mail-ppoint2.akamai.com with ESMTP id 2a72m919up-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-SHA384 bits=256 verify=NOT); Wed, 03 May 2017 11:31:02 -0400
Received: from USTX2EX-DAG1MB1.msg.corp.akamai.com (172.27.27.101) by ustx2ex-dag1mb3.msg.corp.akamai.com (172.27.27.103) with Microsoft SMTP Server (TLS) id 15.0.1263.5; Wed, 3 May 2017 10:31:01 -0500
Received: from USTX2EX-DAG1MB1.msg.corp.akamai.com ([172.27.6.131]) by ustx2ex-dag1mb1.msg.corp.akamai.com ([172.27.6.131]) with mapi id 15.00.1263.000; Wed, 3 May 2017 10:31:01 -0500
From: "Salz, Rich" <rsalz@akamai.com>
To: Colm MacCárthaigh <colm@allcosts.net>, TLS WG <tls@ietf.org>
Thread-Topic: [TLS] Security review of TLS1.3 0-RTT
Thread-Index: AQHSw1NICDv1l4S8FUWU9Zh5nPuktKHiqKmAgAA6vACAAAYlAIAAJaUA//+uO5A=
Date: Wed, 03 May 2017 15:31:00 +0000
Message-ID: <80117b9d07ac40138bd059a603b37847@ustx2ex-dag1mb1.msg.corp.akamai.com>
References: <CAAF6GDcKZj9F-eKAeVj0Uw4aX_EgQ4DuJczL4=fsaFyG9Yjcgw@mail.gmail.com> <cb518e35-c214-d11d-a068-c454b2e7ea6a@gmx.net> <CAAF6GDfQ+YXV4gvhBOOZKC=wtYhxQUy1_2_M+dgfbdL25pppiQ@mail.gmail.com> <BCD73E79-0675-4B71-92B4-3226F0BAB597@dukhovni.org> <CAAF6GDdpq8DgLx5Fo6apoTHgwQsbdn6hb=ozi1+JP9VMxPw6sA@mail.gmail.com>
In-Reply-To: <CAAF6GDdpq8DgLx5Fo6apoTHgwQsbdn6hb=ozi1+JP9VMxPw6sA@mail.gmail.com>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
x-ms-exchange-transport-fromentityheader: Hosted
x-originating-ip: [172.19.36.217]
Content-Type: multipart/alternative; boundary="_000_80117b9d07ac40138bd059a603b37847ustx2exdag1mb1msgcorpak_"
MIME-Version: 1.0
X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2017-05-03_12:, , signatures=0
X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 suspectscore=0 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1703280000 definitions=main-1705030285
X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2017-05-03_12:, , signatures=0
X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 impostorscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1703280000 definitions=main-1705030285
Archived-At: <https://mailarchive.ietf.org/arch/msg/tls/MAn-HwyUe0X5milA__7_Xbs_hp0>
Subject: Re: [TLS] Security review of TLS1.3 0-RTT
X-BeenThere: tls@ietf.org
X-Mailman-Version: 2.1.22
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: Wed, 03 May 2017 15:33:37 -0000

FWIW, I agree with Colm about STEK’s being TLS 1.3’s weakest point, for the reasons he lists.  The security properties are very different from the full-handshake TLS 1.3, and that is why OpenSSL treats “early data” as a completely separate thing from the “normal stream.”

--
Senior Architect, Akamai Technologies
Member, OpenSSL Dev Team
IM: richsalz@jabber.at Twitter: RichSalz

v2.23.0 | Report a Bug | By Email