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Subject: Re: [xri] Re: The elements formerly known as TargetAuthority and TargetSubject

From: "Scott Cantor" <cantor.2@osu.edu>
Sent: Friday, July 03, 2009 5:17 AM
To: "Sakimura Nat" <n-sakimura@nri.co.jp>; "'Drummond Reed'" 
<drummond.reed@cordance.net>; "'Breno de Medeiros'" <breno@google.com>; 
"'XRI TC'" <xri@lists.oasis-open.org>
Subject: RE: [xri] Re: The elements formerly known as TargetAuthority and 

> Nat Sakimura wrote on 2009-07-02:
>> 1. Root XRD Trust
>> The starting XRD, in this case, XRD1 MUST be signed in such a way that
>>   Case B) : Third Party X.509 Certificate
>>     In this case, XRD/ds:KeyInfo/X509Data/ must somehow related to
>>     XRD/Subject. <<<< This needs to be defined!
> I totally agree, but would also caution that it seems to me you're all
> biting off an awful big job here. This amounts to defining a PKI with 
> Naming
> Constraints, something that has pretty much failed elsewhere, so is that
> really in scope to do here? Should it be left to subsequent profiling?

Yeah. This is a big issue. Perhaps just let it be profiled in a community
would be a good compromise for the time being.

>> 2. Delegation
>>    For delegation, besides XRD2's integrity is ok as in 1. above,
> I'm having trouble understanding one piece of this...what is the
> original/delegating XRD signed with? The same key that signs XRD2? It has 
> to
> be signed with something (or authenticated some other way) or this isn't
> useful. If I can attack the original document, I can just point it my XRD.
>>   Case A) If XRD1/Link has Subject,
>>      XRD1/Link/Subject MUST match XRD2/Subject
>>   Case B) Else
>>      XRD1/Link/ds:KeyInfo == XRD2/ds:KeyInfo
>>      <<<< OR shall we just say that
>>         pub key in the XRD1/Link/ds:KeyInfo
>>         == pub key in the XRD2/ds:KeyInfo ?
> I think it's the same as my earlier concern...that's an awfully big piece 
> of
> work to take on.

This is easier than the previous one.
We just want an exact match.

> My only other comment on Drummond's text was that I would suggest against
> trying to profile ds:KeyName into some XRD-specific meaning. If you want 
> to
> identify an <xrd:Subject> as a way of identifying a key, just put that
> element directly into <ds:KeyInfo> (it's extensible).
> -- Scott

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