Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hmac-sha2-06
Nico Williams <nico@cryptonector.com> Wed, 15 April 2015 20:52 UTC
Return-Path: <nico@cryptonector.com>
X-Original-To: kitten@ietfa.amsl.com
Delivered-To: kitten@ietfa.amsl.com
Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 192AE1A8AD9 for <kitten@ietfa.amsl.com>; Wed, 15 Apr 2015 13:52:03 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.666
X-Spam-Level:
X-Spam-Status: No, score=-1.666 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, IP_NOT_FRIENDLY=0.334, RCVD_IN_DNSWL_NONE=-0.0001] 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 PBvw_qHYDrl0 for <kitten@ietfa.amsl.com>; Wed, 15 Apr 2015 13:52:02 -0700 (PDT)
Received: from homiemail-a29.g.dreamhost.com (sub4.mail.dreamhost.com [69.163.253.135]) by ietfa.amsl.com (Postfix) with ESMTP id 136011A8ACF for <kitten@ietf.org>; Wed, 15 Apr 2015 13:52:02 -0700 (PDT)
Received: from homiemail-a29.g.dreamhost.com (localhost [127.0.0.1]) by homiemail-a29.g.dreamhost.com (Postfix) with ESMTP id E678267408D; Wed, 15 Apr 2015 13:52:01 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=cryptonector.com; h=date :from:to:cc:subject:message-id:references:mime-version :content-type:in-reply-to; s=cryptonector.com; bh=aqydrvVJ9vPyP3 HKEr6l+wK32g4=; b=mvgnRWEmV7OzFBwZsrPafPX6aF9YfhxCnllxkyXE74Ba4R Cyya1KZyBcMDfX9a6cpf1GYbfYAZZ9hxYcc5L8LH/atYvCXFnjHyEsSDvxJskXdw yS/RxpAJk/VfrByvKw2dHYHLPHp7iHvRcE4Eq0DKMqoVT3lvDtV7kWNHjAres=
Received: from localhost (108-207-244-174.lightspeed.austtx.sbcglobal.net [108.207.244.174]) (Authenticated sender: nico@cryptonector.com) by homiemail-a29.g.dreamhost.com (Postfix) with ESMTPA id 53B28674070; Wed, 15 Apr 2015 13:52:01 -0700 (PDT)
Date: Wed, 15 Apr 2015 15:52:00 -0500
From: Nico Williams <nico@cryptonector.com>
To: Benjamin Kaduk <kaduk@MIT.EDU>
Message-ID: <20150415205159.GF29890@localhost>
References: <alpine.GSO.1.10.1503301227280.22210@multics.mit.edu>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Disposition: inline
In-Reply-To: <alpine.GSO.1.10.1503301227280.22210@multics.mit.edu>
User-Agent: Mutt/1.5.21 (2010-09-15)
Archived-At: <http://mailarchive.ietf.org/arch/msg/kitten/zK1PLJ_jPksn4mb21Bw6fuzQX-w>
Cc: kitten@ietf.org
Subject: Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hmac-sha2-06
X-BeenThere: kitten@ietf.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: Common Authentication Technologies - Next Generation <kitten.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/kitten>, <mailto:kitten-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/kitten/>
List-Post: <mailto:kitten@ietf.org>
List-Help: <mailto:kitten-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/kitten>, <mailto:kitten-request@ietf.org?subject=subscribe>
X-List-Received-Date: Wed, 15 Apr 2015 20:52:03 -0000
On Mon, Mar 30, 2015 at 12:40:40PM -0400, Benjamin Kaduk wrote: > This message begins the Working Group Last Call (WGLC) of "AES Encryption > with HMAC-SHA2 for Kerberos 5" <draft-ietf-kitten-aes-cts-hmac-sha2-06>. > The WGLC will last two weeks, ending on Monday, April 13th. The draft is > available at: > > https://tools.ietf.org/html/draft-ietf-kitten-aes-cts-hmac-sha2-06 To summarize the changes from RFC3962: - CTS remains the same but is now given by a different reference (SP800-38A+). The motivation is clear (to have a NIST reference for the cipher mode). This should be the same as in RFC3962. (Confounding is still used.) - Use encrypt-then-MAC instead of MAC-then-encrypt. +1 to that. - SHA-256 is used at the 128-bit security level, instead of SHA-1, and the HMAC output is truncated to 128 bits. The keys for the HMAC are 128 bits at the 128-bit security level. - SHA-256 is used at the 192-bit security level, and the HMAC is truncated to 192 bits. The keys for the HMAC are 192 bits at the 192-bit security level. AES-256 is used at the 192-bit security level because AES-192 implementations are not as universally available as AES-256, or something. In any case, I've no objection. I also do not object to the use of HMAC-SHA256-192 with 192-bit keys at the 192 bit security level. Pending a re-review of SP800-38A+ (I think I did it last time around), I'm OK with the contents of this I-D. Nico --
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Benjamin Kaduk
- [kitten] WGLC on draft-ietf-kitten-aes-cts-hmac-s… Benjamin Kaduk
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Greg Hudson
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Benjamin Kaduk
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Greg Hudson
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Jeffrey Altman
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Benjamin Kaduk
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Michael Jenkins
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Jeffrey Altman
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Greg Hudson
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Weijun Wang
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Greg Hudson
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Luke Howard
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Viktor Dukhovni
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… D.Rogers
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Luke Howard
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Viktor Dukhovni
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… D.Rogers
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Benjamin Kaduk
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Nico Williams
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Nico Williams
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Nico Williams
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Nico Williams
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Nico Williams
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Michael Peck
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Viktor Dukhovni
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Greg Hudson
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Nico Williams
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Benjamin Kaduk
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Benjamin Kaduk
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Benjamin Kaduk
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Benjamin Kaduk
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Nico Williams
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Benjamin Kaduk
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Jeffrey Altman
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Michael Peck
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Greg Hudson
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Benjamin Kaduk
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Jeffrey Altman
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Michael Jenkins
- Re: [kitten] WGLC on draft-ietf-kitten-aes-cts-hm… Jeffrey Altman