Re: [Ace] EST over CoAP in ACE wg

Samuel Erdtman <> Mon, 21 November 2016 16:30 UTC

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From: Samuel Erdtman <>
Date: Mon, 21 Nov 2016 17:30:49 +0100
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To: "Kumar, Sandeep" <>
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Cc: Shahid Raza <>, "Panos Kampanakis (pkampana)" <>, "" <>, "" <>
Subject: Re: [Ace] EST over CoAP in ACE wg
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Hi All,

To run EST over DTLS and CoAP to address more constrained devices is not
new to me, this was part of conversations that neXus (my previous employer)
and SICS had about one and a half year ago.

I would support this work. I think certificates makes sense for ACE because
of the connection to existing security infrastructure.

At neXus we did SCEP and CMP enrollment but when moving to more constrained
devices it would make sense to move to use EST over CoAP and DTLS.
In addition to being quite simple compared to SCEP and CMP, EST also
support server side generated keys which could be a benefit for constrained
devices. Not because the devices could not generate the key but in some
case keys needs to be generated in trusted and certified hardware (FIPS, CC
etc.) to "know" that keys are of good quality.


On Mon, Nov 21, 2016 at 3:00 PM, Kumar, Sandeep <>

> Dear ACE members
> Peter van Stok gave a short overview during the ACE f2f meeting on the
> work related to EST (RFC 7030) over DTLS secured CoAP (
> draft-vanderstok-core-coap-est-00
> <>). In the
> meeting there was general interest among the audience for the work and ACE
> as the preferred WG for this item. There are additional drafts and work on
> the same topic like the draft-pritikin-coap-bootstrap-01
> <> and the
> email from Shahid
> msg02029.html
> The idea is to merge these into a single draft (already discussed among
> us).
> We would like to get feedback on the mailing list if indeed ACE would be a
> right place to continue this work as was perceived during the f2f meeting.
> Please respond if you support (or not) the activity going forward in ACE wg.
> Kind Regards
> Sandeep
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