Re: [Rats] Where Do Interaction Models Go?

"Eric Voit (evoit)" <evoit@cisco.com> Fri, 24 July 2020 16:38 UTC

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From: "Eric Voit (evoit)" <evoit@cisco.com>
To: Henk Birkholz <henk.birkholz@sit.fraunhofer.de>
CC: "rats@ietf.org" <rats@ietf.org>
Thread-Topic: [Rats] Where Do Interaction Models Go?
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Subject: Re: [Rats] Where Do Interaction Models Go?
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2 makes good sense.  This allows a common structure which can show the commonality between specific I-Ds.   It also doesn't overburden/slow closure on the architecture doc.

Eric

> Hi list,
> 
> our first virtual session on July 28th is approaching. At the last meeting, we
> highlighted the question: where do interaction models go?
> 
> Context: there are three quite common interaction models (plus minimal
> requirements and information elements for them) that can be used to
> convey RATS Conceptual Messages, such as Evidence or Attestation Results.
> Most Conceptual Messages should include only up-to-date content
> (commonly referred to as "fresh") to be feasible. As a result, interaction
> models directly support methods to show that content is fresh (challenge-
> response & streamed remote attestation) or don't have to because the
> content shows that by itself (time-based remote attestation).
> 
> Problem: Reiterating how the common models work and how they are
> related in every solution draft can prove to be error prone, ambiguous,
> difficult to compare in English, or simply be redundant.
> 
> Solution: Describing them once and then referencing the bulk of it eliminates
> the need for text cloning, danger of inconsistencies/subtle deviations, and
> redundancy in general.
> 
> 
> The remaining question is: where should this content about interaction
> model go?
> 
> 
> At the last meeting four options were presented:
> 
> * Option 1: standalone (one I-D for each model)
> * Option 2: standalone (one I-D for all models)
> * Option 3: all three models merged into the architecture I-D
> * Option 4: each model merged into a separate solution I-D
> 
> Each option has pros and cons. So, I'd like to bring this question to
> the list (,finally... I can be quite slow).
> 
> There is of course the current reference interaction model I-D that
> talks about the three models and how direct anonymous attestation can be
> enabled by all three of them. Please have a quick look, maybe that helps
> to provide some feedback here :) Five drafts reference this one at the
> moment:
> 
> > https://datatracker.ietf.org/doc/draft-birkholz-rats-reference-interaction-
> model/
> 
> We will dedicate some time to this topic on Tuesday and hope for some
> feedback!
> 
> 
> Viele Grüße,
> 
> Henk
> 
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