Re: [Ace] How to specify DTLS MTI in COAP-EST

Hannes Tschofenig <Hannes.Tschofenig@arm.com> Fri, 08 June 2018 06:56 UTC

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From: Hannes Tschofenig <Hannes.Tschofenig@arm.com>
To: Eric Rescorla <ekr@rtfm.com>, Michael Richardson <mcr+ietf@sandelman.ca>
CC: "ace@ietf.org" <ace@ietf.org>
Thread-Topic: [Ace] How to specify DTLS MTI in COAP-EST
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Date: Fri, 8 Jun 2018 06:56:30 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/ace/XxHdYcl1eil9p6HDXuWEMEurfMI>
Subject: Re: [Ace] How to specify DTLS MTI in COAP-EST
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Here are my thoughts:


·       This group or any other IoT group should not come up with their own algorithm recommendations. Reason: we already have a group working on these recommendations - CFRG

·       There is no need to talk about new algorithms recommendations. Reason: the recommendations have already been made by the CFRG and the TLS 1.3 spec lists them.

·       The pace of switching to new crypto algorithm seems to be much slower in the IoT world (for the discussed reasons). I feel there is very little most of us can do to influence the pace. Reason: very few folks work on implementations of crypto algorithms for IoT devices.

Ciao
Hannes

From: Eric Rescorla [mailto:ekr@rtfm.com]
Sent: 07 June 2018 22:21
To: Michael Richardson
Cc: Hannes Tschofenig; ace@ietf.org
Subject: Re: [Ace] How to specify DTLS MTI in COAP-EST

TBH, I'm not a fan of SHOULD+, etc., and they're pretty alien to TLS, so you should just use words if you want to convey these points.

With that said, I don't really understand the objective here: we're generally moving towards the CFRG curves, so what's the reasoning for the P256 MUST and why do you think that will change.

-Ekr



On Thu, Jun 7, 2018 at 10:41 AM, Michael Richardson <mcr+ietf@sandelman.ca<mailto:mcr+ietf@sandelman.ca>> wrote:

Hannes Tschofenig <Hannes.Tschofenig@arm.com<mailto:Hannes.Tschofenig@arm.com>> wrote:
    > why don't you just reference https://tools.ietf.org/html/rfc7925?

Ignorance :-)
Thank you, I think that we will reference it then;

Section 4.4 includes:

        At the time of writing, the
        recommended curve is secp256r1, and the use of uncompressed points
        follows the recommendation in CoAP.  Note that standardization for
        Curve25519 (for ECDHE) is ongoing (see [RFC7748]), and support for
        this curve will likely be required in the future.

which is what we want to say anyway.

    > I am not a big fan of making all sorts of different crypto
    > recommendations in our specs that differ slightly.
--
]               Never tell me the odds!                 | ipv6 mesh networks [
]   Michael Richardson, Sandelman Software Works        | network architect  [
]     mcr@sandelman.ca<mailto:mcr@sandelman.ca>  http://www.sandelman.ca/        |   ruby on rails    [

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