IETF Logo Mail Archive

Re: [lp-wan] IID computation for SCHC over LoRaWAN

Ivaylo Petrov <ivaylo@ackl.io> Tue, 21 January 2020 12:02 UTC

Return-Path: <ivaylo@ackl.io>
X-Original-To: lp-wan@ietfa.amsl.com
Delivered-To: lp-wan@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2D7101200F9 for <lp-wan@ietfa.amsl.com>; Tue, 21 Jan 2020 04:02:07 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.898
X-Spam-Level:
X-Spam-Status: No, score=-1.898 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=ackl-io.20150623.gappssmtp.com
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 m1qwD5VBDU1H for <lp-wan@ietfa.amsl.com>; Tue, 21 Jan 2020 04:02:01 -0800 (PST)
Received: from mail-wr1-x42d.google.com (mail-wr1-x42d.google.com [IPv6:2a00:1450:4864:20::42d]) (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 6162A1200F7 for <lp-wan@ietf.org>; Tue, 21 Jan 2020 04:02:01 -0800 (PST)
Received: by mail-wr1-x42d.google.com with SMTP id z7so2821006wrl.13 for <lp-wan@ietf.org>; Tue, 21 Jan 2020 04:02:01 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ackl-io.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=dacWEC2qwhR7k5g4dVfGDW/BHT8+U2xU+K47ztCtRQA=; b=vprY06imruyZ1rM0VlWsI6md3tI0HXWvd4r4qr6ZgUiLrMSvVVX46Tv/tMJ7k7LJKj mKp6HTXLfcU7Viu1TNX4LPWx7w6tY6tvlPfe+dfYvJGqryJtxnQ8624rUNrHaYf9OtxY FPCXua05aIHZGYvw4pdST278daxpuzdCsNdtKHv9uuQkiAAMdQ8Uxydq9HUGADLFyCIO mIQc/XYXUHybPzAMPD8xWGT1s41/GNreuNN4vxo76PwIstNLhwGukencRwRHgXDFKuJp rzFR9FQeE4uQkeY0Ob6c07GO0Ji6qiR60Om+LsIQS9GMWJzkz9meX24PyhitkWeZmOC+ Am8Q==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=dacWEC2qwhR7k5g4dVfGDW/BHT8+U2xU+K47ztCtRQA=; b=TP4QR/oz+GvEBLRyT6e+qgS8JEdaoitGmuEe5uB4yDS1S7Q8gHRycPrDg3yDv0ZZ8s iNmmsz/lqf5IK2AK+NXV9sBK9CRsN6PqM3W/VhgYBu5i+oEo+VHMq8qOP6mIV2zyodHs 1uaAEPoGs4zh65JJdO/hIUOhVvmWzdDvBh/Q1s5lt0TpSdeKGY3xL8wiQ1uFD/U4F9jx LlCATs7poziClZemhwwMiWiGnHH0brVN43Godt04GltXmL147XMgWtGjhIyALIFZlzFb 7AdB0W4r0fTxk+yu0FhS5rKCuQIyDzWUyBFiX265VaoDmYkfIb9/ug2D7sIcKBizr+ke VaNg==
X-Gm-Message-State: APjAAAWF9e3Z0kx2+BPJn/H+B11/n1nMIiWNewgg++i7A0NGKiwYKkSa nkXOsWSBGWzCihxbBw2cp9VpynOXkP0V3txj/ynmYw==
X-Google-Smtp-Source: APXvYqw5sIh7mjCAhrCKVAxaZ6Ix9iL8Z3jLgt3YFVQOn7fCAw7UddvSwQ++Fxx8vgYMUe4TlrlQGVIczxMYn/bu5iM=
X-Received: by 2002:adf:f88c:: with SMTP id u12mr4601334wrp.323.1579608119729; Tue, 21 Jan 2020 04:01:59 -0800 (PST)
MIME-Version: 1.0
References: <11567_1578583345_5E174531_11567_198_1_DA3D02FA.6E7E3%dominique.barthel@orange.com> <11889_1578583565_5E17460D_11889_448_5_DA3D0478.6E7F1%dominique.barthel@orange.com> <MN2PR11MB35653D0A24CAE9BB7C8A6B1ED8390@MN2PR11MB3565.namprd11.prod.outlook.com> <e3a0968b393740ac9dc290175d5073a9@semtech.com>
In-Reply-To: <e3a0968b393740ac9dc290175d5073a9@semtech.com>
From: Ivaylo Petrov <ivaylo@ackl.io>
Date: Tue, 21 Jan 2020 13:01:33 +0100
Message-ID: <CAJFkdRyRsuNtC_AZkgqy2APJ_W503MkHCO6JdtF_+9DZKjaYpg@mail.gmail.com>
To: Olivier Gimenez <ogimenez@semtech.com>
Cc: "Pascal Thubert (pthubert)" <pthubert@cisco.com>, "dominique.barthel@orange.com" <dominique.barthel@orange.com>, lp-wan <lp-wan@ietf.org>
Content-Type: multipart/alternative; boundary="000000000000dc746e059ca52cea"
Archived-At: <https://mailarchive.ietf.org/arch/msg/lp-wan/2IpdvqX-MsDwas9Y9UOcUL_FZME>
Subject: Re: [lp-wan] IID computation for SCHC over LoRaWAN
X-BeenThere: lp-wan@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: "Low-Power Wide Area Networking \(LP-WAN\), also known as LPWA or Low-Rate WAN \(LR-WAN\)" <lp-wan.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/lp-wan>, <mailto:lp-wan-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/lp-wan/>
List-Post: <mailto:lp-wan@ietf.org>
List-Help: <mailto:lp-wan-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/lp-wan>, <mailto:lp-wan-request@ietf.org?subject=subscribe>
X-List-Received-Date: Tue, 21 Jan 2020 12:02:07 -0000

Hello Olivier,

Could you explain what are your assumptions that lead to collision risk of
1/(2^64)? I don't think that this applies for any network prefix size and
any number of devices.

Cheers,
Ivo


On Tue, Jan 21, 2020 at 9:24 AM Olivier Gimenez <ogimenez@semtech.com>
wrote:

>
>
>
>
> *From:* Pascal Thubert (pthubert) <pthubert@cisco.com>
>
> I hope it’s not too much effort for something that never happens!
>
>
>
> Dear,
>
>
>
> I think that this comment says everything. Collision risk is 1/(2^64) =
> 5.42e-20
>
> In comparison with Aerospace industry: in software (DO178
> <https://en.wikipedia.org/wiki/DO-178B>) and hardware (DO254
> <https://en.wikipedia.org/wiki/DO-254>), a DAL A event (Catastrophic -
> Failure may cause a crash) should be lower than 1e-9 per hour.
>
>
>
> Best regards
>
> Olivier
>
> To view our privacy policy, including the types of personal information we
> collect, process and share, and the rights and options you have in this
> respect, see www.semtech.com/legal.
> _______________________________________________
> lp-wan mailing list
> lp-wan@ietf.org
> https://www.ietf.org/mailman/listinfo/lp-wan
>

v2.23.0 | Report a Bug | By Email