RE: [security-services] Inclusion of Federated Name Registration Protocolin SAML 2.0

> 
> The SP half of the protocol is indeed for those niche cases. I think in
> ID-FF the ability for the IdP to refresh its identifier was added as an
> afterthought, but I think that's actually the more useful half.


<JohnK>

I believe that RNI was added *mostly* for the benefit of the IdP, to 
enable update of the NameID, as Scott noted, to better protect the 
privacy of the Principal. I also believe that there are companies out 
there that find this functionality useful, and would like SPs to support 
their periodic refreshing of NameIDs.
<JohnK>

Could this not be accomplished by the IdP (optionally) returning a "fresh"
federation identifier as part of the AuthNResponse? That is a modest
extension to an existing protocol vs. the introduction of a whole new
request-response pair.

I have not encountered a single deployment where this functionality is in
use or planned to be used. I would be interested in learning about
deployments where this protocol is in use or will be used.

- prateek