Re: [Cfrg] I-D Action:draft-kiyomoto-kcipher2-02.txt
"Wook Shin" <wookshin@kddilabs.jp> Wed, 13 April 2011 08:31 UTC
Return-Path: <wookshin@kddilabs.jp>
X-Original-To: cfrg@ietfc.amsl.com
Delivered-To: cfrg@ietfc.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfc.amsl.com (Postfix) with ESMTP id DF6A8E067E for <cfrg@ietfc.amsl.com>; Wed, 13 Apr 2011 01:31:22 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.559
X-Spam-Level:
X-Spam-Status: No, score=-2.559 tagged_above=-999 required=5 tests=[AWL=0.040, BAYES_00=-2.599]
Received: from mail.ietf.org ([208.66.40.236]) by localhost (ietfc.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id R9TTy+yLzNC9 for <cfrg@ietfc.amsl.com>; Wed, 13 Apr 2011 01:31:22 -0700 (PDT)
Received: from mandala.kddilabs.jp (mandala.kddilabs.jp [IPv6:2001:200:601:12::16]) by ietfc.amsl.com (Postfix) with ESMTP id 91C94E065F for <cfrg@irtf.org>; Wed, 13 Apr 2011 01:31:12 -0700 (PDT)
Received: from localhost (mandala.kddilabs.jp [127.0.0.1]) by mandala.kddilabs.jp (Postfix) with ESMTP id 2E9A61748158; Wed, 13 Apr 2011 17:31:11 +0900 (JST)
X-Virus-Scanned: amavisd-new at kddilabs.jp
Received: from mandala.kddilabs.jp ([127.0.0.1]) by localhost (mandala.kddilabs.jp [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ak-sWiHIMWZ3; Wed, 13 Apr 2011 17:30:48 +0900 (JST)
Received: from ist.sec.kddilabs.jp (ist.sec.kddilabs.jp [IPv6:2001:200:601:d00:2e0:81ff:fe28:b57f]) by mandala.kddilabs.jp (Postfix) with ESMTP id A2566174814B; Wed, 13 Apr 2011 17:30:48 +0900 (JST)
Received: from ohpato-t61.sec.kddilabs.jp by ist.sec.kddilabs.jp (8.14.1/8.12.11) with ESMTP id p3D8V08C019299; Wed, 13 Apr 2011 17:31:02 +0900
Content-Type: text/plain; charset="utf-8"; format="flowed"; delsp="yes"
To: cfrg@irtf.org, Jim Schaad <ietf@augustcellars.com>
References: <20110413010001.17531.11616.idtracker@ietfc.amsl.com> <op.vtur72zepzjggh@ohpato-t61.sec.kddilabs.jp> <00a201cbf9b4$06bc8a00$14359e00$@augustcellars.com>
Date: Wed, 13 Apr 2011 17:30:47 +0900
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
From: Wook Shin <wookshin@kddilabs.jp>
Organization: KDDI
Message-ID: <op.vtva9lw0pzjggh@ohpato-t61.sec.kddilabs.jp>
In-Reply-To: <00a201cbf9b4$06bc8a00$14359e00$@augustcellars.com>
User-Agent: Opera Mail/11.01 (Win32)
X-Antivirus: avast! (VPS 110412-1, 04/13/2011), Outbound message
X-Antivirus-Status: Clean
Subject: Re: [Cfrg] I-D Action:draft-kiyomoto-kcipher2-02.txt
X-BeenThere: cfrg@irtf.org
X-Mailman-Version: 2.1.12
Precedence: list
List-Id: Crypto Forum Research Group <cfrg.irtf.org>
List-Unsubscribe: <http://www.irtf.org/mailman/options/cfrg>, <mailto:cfrg-request@irtf.org?subject=unsubscribe>
List-Archive: <http://www.irtf.org/mail-archive/web/cfrg>
List-Post: <mailto:cfrg@irtf.org>
List-Help: <mailto:cfrg-request@irtf.org?subject=help>
List-Subscribe: <http://www.irtf.org/mailman/listinfo/cfrg>, <mailto:cfrg-request@irtf.org?subject=subscribe>
X-List-Received-Date: Wed, 13 Apr 2011 08:31:23 -0000
Jim, That's my mistake. I think I made that mistake while converting circular shift operations to the combination of XOR and non-circular shit operations. The notation in Section 2.1 should be corrected to <<n t t-bit left shift in an n-bit register >>n t t-bit right shift in an n-bit register and then, the code SubK2((IK[3] <<32 8) XOR (IK[3] >>32 24)) XOR (0x01, 0x00, 0x00, 0x00); should mean that (1) IK[3] gets left-shifted by 8 bits (2) IK[3] gets right-shifted by 24 bits (3) call SubK2() by giving "(1) XOR (2) XOR 0x01000000" as the input parameter Best regards, Wook On Wed, 13 Apr 2011 17:23:10 +0900, Jim Schaad <ietf@augustcellars.com> wrote: > You have a notation that is leaving me puzzled. > > In section 2.1 you say > > <<n Left circular rotation by n bits > > >>n Right circular rotation by n bits > > Which makes sense. > > However in section 2.3.2 you use the notation > > SubK2((IK[3] <<32 8) XOR (IK[3] >>32 24)) XOR > (0x01, 0x00, 0x00, 0x00); > > Which is not covered by the above. > > Additionally I wonder if you mean to use IK[3] in both locations here as > (I think) > > (IK[3] << 8) XOR (IK[3] >> 24) ---> (IK[3] << 8) XOR (IK[3] << (32-24)) > --> (IK[3] << 8) XOR (IK[3] << 8) > > jim > >> -----Original Message----- >> From: Wook Shin [mailto:wookshin@kddilabs.jp] >> Sent: Tuesday, April 12, 2011 6:39 PM >> To: cfrg@irtf.org >> Subject: Re: I-D Action:draft-kiyomoto-kcipher2-02.txt >> >> Hello all, >> >> I've revised our previous draft that explains the KCipher-2 stream >> cipher. >> The current version includes some code snippets written in the C >> language >> syntax, so that it could help implementers get clearer idea of how it >> works >> and help them check their outputs with the test vectors mentioned in the >> draft. >> The new version of the draft can be found at >> http://www.ietf.org/internet-drafts/draft-kiyomoto-kcipher2-02.txt >> >> I have attached a naive implementation of KCipher-2 written in C. >> Two files, KCipher2.c and KCipher2.h, are in the attached .zip file, >> and no >> special option is required to compile and run the program. >> The code snippets and the test vector running examples in the draft are >> from the the attached code. >> >> Please look at the new version of the draft and the code, and let me >> have >> your comments. >> >> Thank you, >> >> Wook -- Wook Shin Information Security Laboratory, KDDI R&D Laboratories, Inc.
- Re: [Cfrg] I-D Action:draft-kiyomoto-kcipher2-02.… Wook Shin
- Re: [Cfrg] I-D Action:draft-kiyomoto-kcipher2-02.… Jim Schaad
- Re: [Cfrg] I-D Action:draft-kiyomoto-kcipher2-02.… Wook Shin
- Re: [Cfrg] I-D Action:draft-kiyomoto-kcipher2-02.… Scott Fluhrer (sfluhrer)
- Re: [Cfrg] I-D Action:draft-kiyomoto-kcipher2-02.… Jim Schaad
- Re: [Cfrg] I-D Action:draft-kiyomoto-kcipher2-02.… Wook Shin
- Re: [Cfrg] I-D Action:draft-kiyomoto-kcipher2-02.… Wook Shin
- Re: [Cfrg] I-D Action:draft-kiyomoto-kcipher2-02.… Joachim Strömbergson
- Re: [Cfrg] I-D Action:draft-kiyomoto-kcipher2-02.… Wook Shin
- Re: [Cfrg] I-D Action:draft-kiyomoto-kcipher2-02.… David McGrew