Re: [AVTCORE] Review of draft-ietf-avtcore-aria-srtp-00

Woo-Hwan Kim <whkim5@ensec.re.kr> Tue, 27 November 2012 02:45 UTC

Return-Path: <woohwankim@gmail.com>
X-Original-To: avt@ietfa.amsl.com
Delivered-To: avt@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 16F3921F851B for <avt@ietfa.amsl.com>; Mon, 26 Nov 2012 18:45:09 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.376
X-Spam-Level:
X-Spam-Status: No, score=-2.376 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, J_CHICKENPOX_26=0.6, RCVD_IN_DNSWL_LOW=-1]
Received: from mail.ietf.org ([64.170.98.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ZebUjZbCDOUO for <avt@ietfa.amsl.com>; Mon, 26 Nov 2012 18:45:08 -0800 (PST)
Received: from mail-ia0-f172.google.com (mail-ia0-f172.google.com [209.85.210.172]) by ietfa.amsl.com (Postfix) with ESMTP id 1BB8C21F8745 for <avt@ietf.org>; Mon, 26 Nov 2012 18:45:08 -0800 (PST)
Received: by mail-ia0-f172.google.com with SMTP id j26so9371006iaf.31 for <avt@ietf.org>; Mon, 26 Nov 2012 18:45:07 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:date:x-google-sender-auth:message-id:subject :from:to:cc:content-type; bh=yFAsrQda+Tzl30WYIaTdw4SMKu6hSyyIup+m+sj3Ck8=; b=I1OxfeuvY6P5n0E7r1IEmFSCFs9fDuFkXev3UyNCdMzPljoebhd48tzTk5IC25Kguq IKu6maO7ENpnJ+f9BorJN6mi0HECGjVVI0jfKfH9A2xHPRPWdJwy4D4egNsN/rlo6LCg Wa+wPv85qC6hAei/3ZzPTvMsZRU/j5O8Iio+Z/WbTNSQuXcARUQequ/bXg/J9+Pf0iHd 7tfT9KF/7RzrbeDTCYl0P+yi+v8X52HoqJQAFOWflbiwuHrQqBWetMbGLmtLXvUnVjet CziblweVaehxCTefgdEj9iiCsIrw2VeDKSv81N4+knVy9s8WPoSKg8bFaTXwK3qyf0nm +q7g==
MIME-Version: 1.0
Received: by 10.50.16.172 with SMTP id h12mr14142178igd.41.1353984307630; Mon, 26 Nov 2012 18:45:07 -0800 (PST)
Sender: woohwankim@gmail.com
Received: by 10.64.47.163 with HTTP; Mon, 26 Nov 2012 18:45:07 -0800 (PST)
Date: Tue, 27 Nov 2012 11:45:07 +0900
X-Google-Sender-Auth: oQnezZ9ANEMoXhgNK_bEp-jP5fI
Message-ID: <CAMRi9CdwmhOvtWkDa5rc9MDHPewqyS5Erf=xHiHReWdwFjY9Nw@mail.gmail.com>
From: Woo-Hwan Kim <whkim5@ensec.re.kr>
To: avt@ietf.org, ekr@rtfm.com
Content-Type: multipart/alternative; boundary=f46d04428c6eb0118804cf7109cb
Cc: Magnus Westerlund <magnus.westerlund@ericsson.com>, Daesung Kwon <ds_kwon@ensec.re.kr>, Je Hong Park <jhpark@ensec.re.kr>
Subject: Re: [AVTCORE] Review of draft-ietf-avtcore-aria-srtp-00
X-BeenThere: avt@ietf.org
X-Mailman-Version: 2.1.12
Precedence: list
List-Id: Audio/Video Transport Core Maintenance <avt.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/avt>, <mailto:avt-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/avt>
List-Post: <mailto:avt@ietf.org>
List-Help: <mailto:avt-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/avt>, <mailto:avt-request@ietf.org?subject=subscribe>
X-List-Received-Date: Tue, 27 Nov 2012 02:45:09 -0000

 Thanks for the review.

 Both SEED and ARIA were established as KS(Korean Standard) by the Ministry
of Knowledge Economy of Korea.
 But SEED and ARIA have different application areas each other.
 While SEED is mainly used for for electronic commerce and financial
service, ARIA is for government use and public purpose.
 As the governmental area is growing recently,
 we need to standardize SRTP-ARIA even though SRTP-SEED is already defined
in RFC 5669.

 As for the ciphersuites, we intended to provide the same funtionality as
SRTP-AES.
 While preparing TLS-ARIA(RFC 6209), we added all the ciphersuites which
are defined for TLS-AES in one document
 following the opinion of TLS ADs.
 So, we referred to RFC 6188 which defines CM-AES-192/256 and the
I.D.(draft-ietf-avtcore-srtp-aes-gcm) on the GCM-AES-128/256 and
CCM-AES-128/256.

Thanks.

Woo-Hwan Kim


> Date: Mon, 5 Nov 2012 13:17:02 -0500
> From: Eric Rescorla <ekr@rtfm.com>
> To: avt@ietf.org
> Subject: [AVTCORE] Review of draft-ietf-avtcore-aria-srtp-00
> Message-ID:
> <CABcZeBNWmUYaMZTo5BTN9_YJATNQERrsNpn_CF5Q4FegOwcYPw@mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1
>
> I have reviewed draft-ietf-avtcore-aria-srtp-00.
>
> I'm leaving aside the question of whether it's useful to define
> another symmetric encryption algorithm for SRTP (my view is generally
> no, especially since we have already specified SEED)
> but the WG seems to have decided that.
>
> With that said I don't really understand why you are defining three
> key sizes and three counter modes. I would recommend defining only 128
> and 256-bit GCM unless there is some actual reason not to.
>
> Other than that, this seems like a reasonably plausible draft.
>
>