Re: [Perc] Cullen random notes from design call Nov 30

Emil Ivov <emcho@jitsi.org> Mon, 30 November 2015 22:14 UTC

Return-Path: <emcho@sip-communicator.org>
X-Original-To: perc@ietfa.amsl.com
Delivered-To: perc@ietfa.amsl.com
Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 46DD41B2A55 for <perc@ietfa.amsl.com>; Mon, 30 Nov 2015 14:14:35 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.278
X-Spam-Level:
X-Spam-Status: No, score=-1.278 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, SPF_PASS=-0.001] 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 e6NMOJOyho8Q for <perc@ietfa.amsl.com>; Mon, 30 Nov 2015 14:14:34 -0800 (PST)
Received: from mail-oi0-x231.google.com (mail-oi0-x231.google.com [IPv6:2607:f8b0:4003:c06::231]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 04B4F1B2A53 for <perc@ietf.org>; Mon, 30 Nov 2015 14:14:33 -0800 (PST)
Received: by oiww189 with SMTP id w189so104702727oiw.3 for <perc@ietf.org>; Mon, 30 Nov 2015 14:14:33 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=jitsi-org.20150623.gappssmtp.com; s=20150623; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; bh=GuGuJWzISczdrp0eUJhZKE+8zEqUArsH0/KM0jCUros=; b=MQEMb47Nm5I69V18XMYYh+teMxK5ZpSdG8LuOK6vQSIPwi+aRljCzuHbf9DxzR93lh mf1FGeT/KPZsHhINBQknmpEgHwBvrLfs9kOQtALEoLPdDNdRnNBL51W920RZQsdJVpcz GS166dfvhJNfn9dx9aOHrgJiCH4/kDQ0TVQet8PINlCJbN4XfmXeaRyam7fiBEaOBMmK t5TrrHOR2buJOqveAxWvZEAKp1uJuXaKTqlya0e2TU9sARYeoiyzQ2lghYBnJ9yfZENs eaAPAJ1geOnNKC/v1FcqqbaXkfVrFNOhtIya6sWvmRR93zSMn0QeujL9oNkrqF0aIoKv RGVg==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=GuGuJWzISczdrp0eUJhZKE+8zEqUArsH0/KM0jCUros=; b=EpLmQLRBT23gMfoyxx9uAhhOz0E/t8FoUmmc4368uCufNARF7UlUdLbG6f7bfdZFV1 +chhfewxn2aihxYCJF4PiivBHxhu8+hd/RI23rad1z9/S5j7amms/96GkuZrh2DpBHol /2NmsF80Yh9efd/lUhy5jArtmUXifEZBKRrv2c2YftiNNvBqK0hlH2WQWczweBjYeUFM T85ZHL9VNunbdsllaQLir1K+R9YoQJ0Im8Yn8hw9qvVpDxCtBGHh6sYGeyI2oMM+tS0D 9iHafjSWQkMgU7nyFZ5sXlfENwDKdwKI1/py0aemOsRQCuET7ltCpPeBG3vuk98UdlrE NQ4A==
X-Gm-Message-State: ALoCoQkRp+NcHdoZXrptDQ/DVRxiHcgkbxnLnOZXOTjqyiBro/idI7j+ueKxVybak4FiHau5IRmm
X-Received: by 10.202.105.73 with SMTP id e70mr33972666oic.137.1448921673235; Mon, 30 Nov 2015 14:14:33 -0800 (PST)
Received: from mail-oi0-f47.google.com (mail-oi0-f47.google.com. [209.85.218.47]) by smtp.gmail.com with ESMTPSA id n9sm21522303oev.11.2015.11.30.14.14.32 for <perc@ietf.org> (version=TLSv1/SSLv3 cipher=OTHER); Mon, 30 Nov 2015 14:14:33 -0800 (PST)
Received: by oige206 with SMTP id e206so104555189oig.2 for <perc@ietf.org>; Mon, 30 Nov 2015 14:14:32 -0800 (PST)
MIME-Version: 1.0
X-Received: by 10.202.199.150 with SMTP id x144mr18191781oif.89.1448921672210; Mon, 30 Nov 2015 14:14:32 -0800 (PST)
Received: by 10.76.56.138 with HTTP; Mon, 30 Nov 2015 14:14:32 -0800 (PST)
In-Reply-To: <779F5752-BE63-4A6F-B432-BE2D748A9C68@cisco.com>
References: <779F5752-BE63-4A6F-B432-BE2D748A9C68@cisco.com>
Date: Mon, 30 Nov 2015 16:14:32 -0600
X-Gmail-Original-Message-ID: <CAPvvaaLs3SBP8beOHc5zoj_51gQFm1sf4D0gBz6Tzv7+bHv0ig@mail.gmail.com>
Message-ID: <CAPvvaaLs3SBP8beOHc5zoj_51gQFm1sf4D0gBz6Tzv7+bHv0ig@mail.gmail.com>
From: Emil Ivov <emcho@jitsi.org>
To: "Cullen Jennings (fluffy)" <fluffy@cisco.com>
Content-Type: multipart/alternative; boundary="001a1134eaf29478c70525c95df4"
Archived-At: <http://mailarchive.ietf.org/arch/msg/perc/-kauKREPONAaCTSfBKheliOe7xg>
Cc: "perc@ietf.org" <perc@ietf.org>
Subject: Re: [Perc] Cullen random notes from design call Nov 30
X-BeenThere: perc@ietf.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: Privacy Enhanced RTP Conferencing <perc.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/perc>, <mailto:perc-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/perc/>
List-Post: <mailto:perc@ietf.org>
List-Help: <mailto:perc-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/perc>, <mailto:perc-request@ietf.org?subject=subscribe>
X-List-Received-Date: Mon, 30 Nov 2015 22:14:35 -0000

On Monday, 30 November 2015, Cullen Jennings (fluffy) <fluffy@cisco.com>
wrote:
>
>
> SSRC
> - splicing attack not possible if group key not given to different
> endpoints with same SSRC. Magnus and I agree on pushing this up to next
> layer and then we can discuss the various ways this could be done.
>
> - adam point out if change SSRC ever 20 ms packet sill like average of 71
> weeks to have a collision
>
> - mo  point out it is just not 32 bits here but bunch more
>
> - no one on call arguing for changing SSRC
>
> very complicated to have secure RTCP if you allow this to change
>
> Decision on call is MDD can not change SSRC


I must be very confused but I saw a bunch of implementors here stating that
banning SSRC rewriting would make PERC very impractical.

Did I miss a thread where all of them retracted and said "no, it's actually
fine so don't mind us" or does this working group not care about fostering
adoption?

Emil

--sent from my mobile


-- 
sent from my mobile