Ashish lists different sharing models - and categorizes identity protocols accordingly. What clashes for me in Ashish's post is that, as I see it, he conflates sharing of attributes, the decision to do so with a given requestor or not rightfully belonging to a user, with the trust models that the different identity systems typically get deployed into (these decisions belonging to the providers). The decisions providers make in selecting federation partners, determined by assessment of risk, liability,
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