[TLS] new version of draft-ietf-tls-pwd

"Dan Harkins" <dharkins@lounge.org> Thu, 12 December 2013 19:39 UTC

Return-Path: <dharkins@lounge.org>
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 B897C1AE429 for <tls@ietfa.amsl.com>; Thu, 12 Dec 2013 11:39:43 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.467
X-Spam-Level:
X-Spam-Status: No, score=-2.467 tagged_above=-999 required=5 tests=[BAYES_05=-0.5, IP_NOT_FRIENDLY=0.334, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_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 hCMc8nc-9Dba for <tls@ietfa.amsl.com>; Thu, 12 Dec 2013 11:39:41 -0800 (PST)
Received: from colo.trepanning.net (colo.trepanning.net [69.55.226.174]) by ietfa.amsl.com (Postfix) with ESMTP id 190811AE427 for <tls@ietf.org>; Thu, 12 Dec 2013 11:39:41 -0800 (PST)
Received: from www.trepanning.net (localhost [127.0.0.1]) by colo.trepanning.net (Postfix) with ESMTP id 4BDD910224008 for <tls@ietf.org>; Thu, 12 Dec 2013 11:39:35 -0800 (PST)
Received: from 69.12.173.8 (SquirrelMail authenticated user dharkins@lounge.org) by www.trepanning.net with HTTP; Thu, 12 Dec 2013 11:39:35 -0800 (PST)
Message-ID: <6533edf7da9256371b12b19662afa1cf.squirrel@www.trepanning.net>
Date: Thu, 12 Dec 2013 11:39:35 -0800 (PST)
From: "Dan Harkins" <dharkins@lounge.org>
To: tls@ietf.org
User-Agent: SquirrelMail/1.4.14 [SVN]
MIME-Version: 1.0
Content-Type: text/plain;charset=iso-8859-1
Content-Transfer-Encoding: 8bit
X-Priority: 3 (Normal)
Importance: Normal
Subject: [TLS] new version of draft-ietf-tls-pwd
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: <http://www.ietf.org/mail-archive/web/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: Thu, 12 Dec 2013 19:39:43 -0000

  Hello,

  I just uploaded draft-iet-tls-pwd-03 that incorporates resolution
to comments received from WGLC. These include:

  - test vectors of an example exchange (added to -02).
  - address the issue Bodo Moeller described that allowed a server
     to impose a weak group on the client.
  - inclusion of a technique to protect the username based on
     a comment by Trevor Perrin.

The scheme for username protection has a number of benefits:

   - it does not increase the number of messages
   - it does not require storage of any server secrets on clients
   - is resistant to passive monitoring attack and active attack
      by a malicious server (no I will not be providing a security
      proof to back up those claims)
   - protected username will be different with each run of the
      protocol
   - minimal overhead-- 32+16 = 48 bytes leaving enough
      for insanely long usernames

and the drawbacks are that it opens up a potential for DoS
attacks and it also does not have any forward secrecy-- server
compromise can result in the disclosure of the names of clients
from previous runs of the protocol.

  regards,

  Dan.