Re: [OAUTH-WG] [Openid-specs-ab] Simple Web Discovery

John Bradley <> Thu, 28 October 2010 15:39 UTC

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From: John Bradley <>
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Date: Thu, 28 Oct 2010 12:40:58 -0300
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Subject: Re: [OAUTH-WG] [Openid-specs-ab] Simple Web Discovery
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In the case where the user logs in to a RP with a PPID type identifier.  

How could the person then allow the RP to discover their service endpoints.
Also conversely would publishing the endpoint provide a way for the RP to correlate the user without permission.

One common practice for openID PPID is that the IdP generates the PPID via AES128(actual ID + RP or sector identifier).

In that case the RP could do an oauth flow to the IdP discovery endpoint to get permission to see the user endpoints.
The IdP could decrypt the opaque identifier to determine the actual subject.

That would protect the non correlation unless the user decides to permit discovery.

The model if not the details seem similar to some work that is being submitted to the ITU-T as I understand it.

John B.

On 2010-10-28, at 12:07 PM, Anthony Nadalin wrote:

> Sampo, can you give a usecase of how you would use the pairwise
> -----Original Message-----
> From: [] On Behalf Of
> Sent: Tuesday, October 26, 2010 6:40 PM
> To: Mike Jones
> Cc:;;;
> Subject: Re: [Openid-specs-ab] [OAUTH-WG] Simple Web Discovery
> Simple enough spec. I like the notion of service type. However some questions to answer:
> How would one convey saml2:Assertion as the "principal"? Or how would one convey a saml2:NameID as the "principal"?
> Or in more generic sense, how would one convey a pairwise pseudonym as principal?
> Cheers,
> --Sampo
> Mike Jones <> said:
>> Having a simple discovery method for services and resources is key to enabling many Internet scenarios that require interactions among parties that do not have pre-established relationships.  For instance, if Joe, with e-mail address, wants to share his calendar with Mary, then Mary's calendar service, in the general case, will need to discover the location of Joe's calendar service.  For example, Mary's calendar service might discover that Joe's calendar service is located at by doing discovery for a service named  at for the account joe.
>> Yaron Goland<> and I are submitting this Simple Web Discovery (SWD)<> draft (attached and at for consideration by the community to address this need.  SWD is simple to understand and implement, enables different permissions to be applied to discovery of different services, and is JSON-based.  I look forward to discussing this with many of you next week at IIW<>w/>.
>>                                                                -- 
>> Mike
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