Should we re-visit the intuition that identities can be federated? Do we really know what it means to "add up" a bank card and a Medicare card? Do we have the mathematics to do such a thing with rigor, asks Stephen Wilson.
I wonder ...
Is a passport an "identifier"?
Is a drivers licence an identifier?
Is a credit card an identifier?
Is a professional membership card an identifier?
Is a building access card an identifier?
Is a house key an identifier?
Is a car key an identifier?
Or putting the questions another way ...