Re: [perpass] privacy implications of UUIDs for IoT devices

Brian E Carpenter <brian.e.carpenter@gmail.com> Fri, 14 October 2016 22:18 UTC

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To: Eitan Adler <lists@eitanadler.com>, Fernando Gont <fgont@si6networks.com>
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From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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Date: Sat, 15 Oct 2016 11:18:40 +1300
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Cc: "perpass@ietf.org" <perpass@ietf.org>, Peter Saint-Andre - Filament <peter@filament.com>, Dave Thaler <dthaler@microsoft.com>, George Michaelson <ggm@algebras.org>
Subject: Re: [perpass] privacy implications of UUIDs for IoT devices
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On 15/10/2016 00:14, Eitan Adler wrote:
> On 13 October 2016 at 21:23, Fernando Gont <fgont@si6networks.com>; wrote:
>> On 10/05/2016 09:09 PM, Dave Thaler wrote:
>>> The issue with IEEE MAC's is that it's sent to untrusted observers, not that it is a stable identifier per se.
>>> It just so happens that you typically don't have a choice but to send it in packets such that it can be observed
>>> by untrusted observers, hence the need to use randomized MACs.
>>
>> The issue with MAC addresses is that they are constant across networks
>> when, if anything, they just need to be stable within the same subnet.
>>
>> Besides, they have semantics (vendor ID) when in fact they need not.
>>
>> And well, the problem is exacerbated by IPv6 SLAAC traditionally
>> generating IPv6 IIDs by embedding the underlying MAC address into them...
> 
> Though RFC 4941 exists for this particular issue.

And RFC 7217 for enterprise-like situations, RFC 7721 for general discussion
of the topic, and draft-ietf-6man-default-iids which is currently with the IESG.

    Brian