Re: [Rats] AD Review of draft-ietf-rats-architecture-15

Michael Richardson <> Sat, 23 July 2022 19:33 UTC

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From: Michael Richardson <>
To: Roman Danyliw <>, "" <>
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Comments: In-reply-to Roman Danyliw <> message dated "Thu, 21 Jul 2022 21:20:03 -0000."
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Date: Sat, 23 Jul 2022 15:32:57 -0400
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Subject: Re: [Rats] AD Review of draft-ietf-rats-architecture-15
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    Roman> What I'm getting from this text is that there is "producing" and
    Roman> "consuming" per Section 4.  I took those terms to be
    Roman> describing/constraining information flow -- what information can
    Roman> comes and go among the various architectural elements.  It appears
    Roman> that Section 5 is introducing a new behavior which is "accepting"
    Roman> (receiving but not processing) and "passing" (sending but not
    Roman> processing).  There also appear to be element specific behavior of
    Roman> "caching".

    Roman> I see no conflict with these four behaviors.  My concern is that
    Roman> these nuances in behavior were not explicitly stated.  They should
    Roman> be.  Furthermore, just as certain architectural elements are
    Roman> defined by what they can produce or consume, I'm wondering if the
    Roman> same is true for the "accepting"/"passing" behavior?

I'm having a lot of problems dealing with this comment.
I've discussed this around the design team that is here at the hackathon, and
we are really not sure what to do here.  In the terminology section, have a
pattern like:

   Verifier:  A role performed ...
      Consumes: Evidence, ...
      Produces: Attestation ...

It isn't clear to me if you'd like us to add Passing:, Caching: and Accepting:
to the terminology section.   I think that we don't really want to do that,
because it really only applies in two cases (the RP when Background check),
and the Attester in passport model.

I really don't think section 5 is that mysterious that it needs more introduction.
I would really like some more opinions from the WG.

Michael Richardson <>, Sandelman Software Works
 -= IPv6 IoT consulting =-