Re: [Rats] Composite Evidence
Michael Richardson <mcr+ietf@sandelman.ca> Thu, 23 January 2020 20:26 UTC
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Date: Thu, 23 Jan 2020 15:26:46 -0500
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Subject: Re: [Rats] Composite Evidence
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Eric Voit (evoit) <evoit@cisco.com> wrote: >> First, I found the diagram confusing, because I think you rotated our >> previous diagram 90 degress clockwise. > As I was adopting the passport model, I used the Architecture Document > Figure 4 in Section 5.1 as a base. Yes, I knew that, but I think we need to meld it into the diagram we have, so we need to find a way to allow people's visual cortex to map things visually. >> Second, I found the extra hash(),@time, stuff distracting, as it went into > a >> level of detail that just confused me. > I need to put together a submission which defines the elements diagram. > These details are important for exposing why I see the intersections of > evidence types and composite evidence being quite important. Some of these > reasons are exposed in my reply to Dave & Ned which dives into three types > of evidence (i), (ii), & (iii). I'm happy if you have "ev(i)","ev(ii)", etc. and explain that in the text. >> Give an example of something that would not fall into that category. >> Maybe you are trying to abstract "has a signature" to things that can be >> verified without a asymmetric digital signature. (KerbV Ticket?) > It is true I am trying to abstract away from "has a signature". I didn't > want to exclude things like the possibility that Verifier B to go back to > Verifier A if a trust relationship hasn't been established between them yet. How about "signature (or equivalent)" >> I think that the key thing that we needed to be able to say is that > Composite >> Evidence is not: >> 1) struct evidence_claims foo[]; >> -or- >> 2) struct attestation_results foo[]; >> >> but rather: >> union composite_evidence { >> struct evidence_claims ec; >> struct attestation_results ar; >> } foo[]; > I very much agree with your code above. And the definition needs to reflect > this. The question which Ned & Dave open up is whether types of > evidence_claims need to be exposed in your union composite_evidence. Of course "struct evidence_claims" is a structure, I expect it to often be an EAT. So I'm not sure I understand the debate. > directly hits my question of whether the definition of composite evidence > needs to intersect the definition of evidence types (i), (ii), & (iii). > The more I think about this in the context of your code above, the more I am > hoping to keep the two concepts orthogonal. Is the question about how this union is distinguished? -- ] Never tell me the odds! | ipv6 mesh networks [ ] Michael Richardson, Sandelman Software Works | IoT architect [ ] mcr@sandelman.ca http://www.sandelman.ca/ | ruby on rails [ -- Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works -= IPv6 IoT consulting =-
- [Rats] Composite Evidence Eric Voit (evoit)
- Re: [Rats] Composite Evidence Smith, Ned
- Re: [Rats] Composite Evidence Dave Thaler
- Re: [Rats] Composite Evidence Michael Richardson
- [Rats] 答复: Composite Evidence Xialiang (Frank, Network Standard & Patent Dept)
- Re: [Rats] Composite Evidence Smith, Ned
- Re: [Rats] Composite Evidence Eric Voit (evoit)
- Re: [Rats] Composite Evidence Eric Voit (evoit)
- Re: [Rats] Composite Evidence Eric Voit (evoit)
- Re: [Rats] Composite Evidence Smith, Ned
- Re: [Rats] Composite Evidence Michael Richardson
- Re: [Rats] Composite Evidence Michael Richardson
- Re: [Rats] Composite Evidence Eric Voit (evoit)
- Re: [Rats] Composite Evidence Eric Voit (evoit)
- Re: [Rats] Composite Evidence Smith, Ned
- Re: [Rats] Composite Evidence Smith, Ned
- Re: [Rats] Composite Evidence Eric Voit (evoit)
- Re: [Rats] Composite Evidence Eric Voit (evoit)
- Re: [Rats] Composite Evidence Laurence Lundblade
- Re: [Rats] Composite Evidence Smith, Ned
- Re: [Rats] Composite Evidence Smith, Ned
- Re: [Rats] Composite Evidence Michael Richardson
- Re: [Rats] Composite Evidence Michael Richardson
- Re: [Rats] Composite Evidence Michael Richardson
- Re: [Rats] Composite Evidence Smith, Ned
- Re: [Rats] Composite Evidence Michael Richardson
- Re: [Rats] Composite Evidence Smith, Ned