Conor and Paul both recently responded to James’ questions on federated authorization. Conor quite rightly pointed out that I managed to describe two common scenarios involving federation and authorization without explicitly answering the question - “Does Federated Identity sometimes require Federated Authorization?”. As much as it pains me, I have to agree with Conor here - federated identity per se does not require federated authorization - rather, the resource owner might require it. It all depends on the use case that you’re implementing.
James also alerted me this morning to a very interesting post from Shekhar Jha. I’ll have to take the time to read the SecPAL paper properly, and, even then, there are people far better qualified than me to comment on this, but it does look interesting - particularly the fact that there is a natural language-like, non-XML syntax.
Shekhar goes on to discuss relationships in the identity domain. I refer Shekhar to the excellent work done by Paul on the People Service - FAQ, white paper [PDF], specification [PDF]. This seems to map neatly onto what Shekhar is saying.
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