Re: [Ace] EDHOC standardization

Benjamin Kaduk <kaduk@mit.edu> Sat, 03 November 2018 15:16 UTC

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Date: Sat, 3 Nov 2018 10:16:21 -0500
From: Benjamin Kaduk <kaduk@mit.edu>
To: Michael Richardson <mcr+ietf@sandelman.ca>
Cc: John Mattsson <john.mattsson@ericsson.com>, "alvador.p.f@um.es" <alvador.p.f@um.es>, "ace@ietf.org" <ace@ietf.org>
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References: <379B1A31-1F7E-43A6-A518-4398570CBBC7@ericsson.com> <16572.1541199115@dooku.sandelman.ca>
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Subject: Re: [Ace] EDHOC standardization
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On Sat, Nov 03, 2018 at 05:51:55AM +0700, Michael Richardson wrote:
> 
> John Mattsson <john.mattsson@ericsson.com> wrote:
>     > of negotiation is still needed. The current plan for the next version
>     > is to introduce cipher suites and to let the cipher suite with value 0
>     > indicate that algorithms have been negotiated out-of-band.
> 
> I agree with the idea that some common default should be very easy to
> refer to, but I don't like the idea that the gateway has to remember what
> the out-of-band "default" is on a per-device basis.  I would say that we need
> at least 0/1, so that we can say that it's the current vs the "new" default.
> 
> If you consider the case where the sensor is on very low bandwidth
> connection (I would say LoRaWAN, but I am not well qualified in that space).
> The sensor gets visited every two or three years by a technician (if only to
> make sure that the sensor is still where it is supposed to be).  While there
> new firmware updates are applied, and as a result the algorithm defaults are
> updated.  During the cycle, some devices are updated and some are still old.

Are you proposing that the management of the 0/1-to-algorithm mapping be
managed on a per-deployment basis or by the IETF?

-Ben