Re: [Coma] If all you had was an LED ...

Johannes Gilger <gilger@umic.rwth-aachen.de> Fri, 08 June 2012 07:26 UTC

Return-Path: <gilger@umic.rwth-aachen.de>
X-Original-To: coma@ietfa.amsl.com
Delivered-To: coma@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 629E221F86B3 for <coma@ietfa.amsl.com>; Fri, 8 Jun 2012 00:26:24 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.598
X-Spam-Level:
X-Spam-Status: No, score=-2.598 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FUZZY_VLIUM=0.001]
Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id hG3IlMhEE5Bw for <coma@ietfa.amsl.com>; Fri, 8 Jun 2012 00:26:23 -0700 (PDT)
Received: from avalon.gnuzifer.de (avalon.gnuzifer.de [IPv6:2a01:4f8:121:43c1::a2:1]) by ietfa.amsl.com (Postfix) with ESMTP id 9CA7F21F85A2 for <coma@ietf.org>; Fri, 8 Jun 2012 00:26:22 -0700 (PDT)
Received: from [137.226.161.159] (port=59474 helo=localhost) by avalon.gnuzifer.de with esmtpsa (TLS1.0:DHE_RSA_AES_128_CBC_SHA1:16) (Exim 4.72) (envelope-from <gilger@umic.rwth-aachen.de>) id 1SctaO-0004SK-It; Fri, 08 Jun 2012 09:26:20 +0200
Date: Fri, 8 Jun 2012 09:26:25 +0200
From: Johannes Gilger <gilger@umic.rwth-aachen.de>
To: Cullen Jennings <fluffy@iii.ca>
Message-ID: <20120608072625.GA5539@blackbox>
References: <2806342D-A112-4727-A584-4295E141B3E0@iii.ca>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
In-Reply-To: <2806342D-A112-4727-A584-4295E141B3E0@iii.ca>
User-Agent: Mutt/1.5.21 (2010-09-15)
X-SA-Exim-Connect-IP: 137.226.161.159
X-SA-Exim-Mail-From: gilger@umic.rwth-aachen.de
Cc: coma@ietf.org
Subject: Re: [Coma] If all you had was an LED ...
X-BeenThere: coma@ietf.org
X-Mailman-Version: 2.1.12
Precedence: list
List-Id: Management of Constrained Networks and Devices <coma.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/coma>, <mailto:coma-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/coma>
List-Post: <mailto:coma@ietf.org>
List-Help: <mailto:coma-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/coma>, <mailto:coma-request@ietf.org?subject=subscribe>
X-List-Received-Date: Fri, 08 Jun 2012 07:26:24 -0000

Hi list,

On 07/06/12 11:40, Cullen Jennings wrote:
> How would you use these 1 or two LEDs to help manage the device? 
>
> It would be possible to send a small message as a burst of rapidly
> changing light patterns that was detectable by the video camera on a
> smart phone. Would it make sense to use this for something like POST
> codes on PCs? 
> 
> What are the various states that an operator would want to be able to
> see? I'm assuming this is mostly states that are important when one
> can't get networked base management. 
> 
> Thoughts? Pointers to what existing systems do ?

I'm also interested about this (or very similar) out-of-band channels in
real-world applications. Using the LED OOB-channel could prove to be a
reliable way to manage the devices, and maybe even to exchange security
parameters. If there was a protocol, it would help in exchanging
different kinds of information (short POST-like codes vs. whole
shared/asymmetric keys) over the air.

This also brings me to the question of how much this list
will touch into management of security, i.e. bootstrapping of security
associations, setting of access control rights, etc.

Regards,
Johannes

-- 
Dipl.-Inform. Johannes Gilger
Research Group IT-Security
UMIC Research Centre
RWTH Aachen University
Mies-van-der-Rohe-Stra├če 15
52074 Aachen

Office: 211
Phone: +49 241 80 20781
Fax:   +49 241 80 22731

http://itsec.rwth-aachen.de