Re: [Rats] CoSWID and EAT and CWT

Ira McDonald <blueroofmusic@gmail.com> Thu, 21 November 2019 01:00 UTC

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From: Ira McDonald <blueroofmusic@gmail.com>
Date: Wed, 20 Nov 2019 20:00:28 -0500
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To: Laurence Lundblade <lgl@island-resort.com>, Ira McDonald <blueroofmusic@gmail.com>
Cc: sacm <sacm@ietf.org>, rats@ietf.org
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Subject: Re: [Rats] CoSWID and EAT and CWT
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Hi Laurence,

That seems like a good suggestion for a simple way to integrate CoSWID
content
into EAT.

Cheers,
- Ira

Ira McDonald (Musician / Software Architect)
Co-Chair - TCG Trusted Mobility Solutions WG
Co-Chair - TCG Metadata Access Protocol SG
Chair - Linux Foundation Open Printing WG
Secretary - IEEE-ISTO Printer Working Group
Co-Chair - IEEE-ISTO PWG Internet Printing Protocol WG
IETF Designated Expert - IPP & Printer MIB
Blue Roof Music / High North Inc
http://sites.google.com/site/blueroofmusic
http://sites.google.com/site/highnorthinc
mailto: blueroofmusic@gmail.com
PO Box 221  Grand Marais, MI 49839  906-494-2434



On Wed, Nov 20, 2019 at 7:35 PM Laurence Lundblade <lgl@island-resort.com>
wrote:

> Hi,
>
> I’m not on the SACM list, but did look at the archive. Hopefully I’m not
> out of sync.
>
> My thought is to register one claim for CWT that is an entire CoSWID (in
> CDDL the concise-swid-tag).
>
> That way CoSWID can grow and develop on its own without lots of adds and
> subtracts to the CWT registry. It has its own IANA registry with its own
> experts and such. Seems like the coupling / factoring is about right.
>
> This would also be the way I’d like to have it in EAT attestation. We’ve
> done a mini version of this with the location claim
> <https://tools.ietf.org/html/draft-ietf-rats-eat-01#section-3.8>.
>
> Then if you just want to sign a CoSWID CWT style, this works pretty well
> too. It has a slight overhead compared to having all the CoSWID data items
> as direct CWT claims in that it will have an additional map layer, but that
> is only about three bytes.
>
> LL
>
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