I don’t believe that this is a useful spec without meaningful key presentation 
mechanisms. 

 — Justin

> On Jul 5, 2018, at 11:04 AM, Mike Jones 
> <Michael.Jones=40microsoft....@dmarc.ietf.org> wrote:
> 
> I'm fine putting some bandwidth into finishing OAuth PoP Key Distribution - 
> particularly now that OAuth AS Metadata is finally done.  I know that Hannes 
> is willing to do so as well.
> 
>                               -- Mike
> 
> -----Original Message-----
> From: OAuth <oauth-boun...@ietf.org> On Behalf Of Ludwig Seitz
> Sent: Tuesday, July 3, 2018 11:56 PM
> To: oauth@ietf.org
> Subject: Re: [OAUTH-WG] PoP Key Distribution
> 
> On 2018-07-03 21:46, Hannes Tschofenig wrote:
>> Hi all,
>> 
> .....
>> Where should the parameters needed for PoP key distribution should be 
>> defined? Currently, they are defined in two places -- in
>> https://tools.ietf.org/html/draft-ietf-ace-oauth-authz-13 and also in 
>> https://tools.ietf.org/html/draft-ietf-oauth-pop-key-distribution-03. 
>> In particular, the audience and the token_type parameters are defined 
>> in both specs.
>> 
>> IMHO it appears that OAuth would be the best place to define the 
>> HTTP-based parameters. ACE could define the IoT-based protocols, such 
>> as CoAP, MQTT, and alike. Of course, this is subject for discussion, 
>> particularly if there is no interest in doing so in the OAuth working 
>> group.
>> 
> 
> I fully agree that OAuth would be the best place. I've only drawn some of 
> these parameters into draft-ietf-ace-oauth-authz because the work on 
> draft-ietf-oauth-pop-key-distribution seemed to have been discontinued (it 
> expired August 2017).
> That said, I'd hate to introduce a normative dependency into 
> draft-ietf-ace-oauth-authz on a document that will not move forward or only 
> move very slowly. What are the prospects of going forward quickly with 
> draft-ietf-oauth-pop-key-distribution?
> 
>> There is also a misalignment in terms of the content.. 
>> draft-ietf-oauth-pop-key-distribution defined an 'alg' parameter, 
>> which does not exist in the draft-ietf-ace-oauth-authz document. The 
>> draft-ietf-ace-oauth-authz document does, however, have a profile 
>> parameter, which does not exist in 
>> draft-ietf-oauth-pop-key-distribution. Some alignment is therefore 
>> needed. In the meanwhile the work on OAuth meta has been finalized and
> 
> It seems indeed that 'alg' and 'profile' parameters have some overlap, 
> although 'alg' seemed a bit more narrow to me (which is why I created 
> 'profile').  If we could extend the definition of 'alg' a bit, I'd be OK to 
> remove 'profile' from the ACE draft (provided the OAuth draft moves forward 
> in a timely manner).
> 
> 
> /Ludwig
> 
> --
> Ludwig Seitz, PhD
> Security Lab, RISE SICS
> Phone +46(0)70-349 92 51
> 
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