Airline mileage cards. Many airlines issue frequent-?¬‚yer
cards to customers, enabling users to accumulate points
for ?¬‚ights taken, which can then be redeemed for
rewards. Because not every airline can cover every territory
across the globe, airlines have then done the next
best thing; they have created a federation, a partnership
of airlines that allows customers to accumulate points on
a plan held with any one of the federated airlines when
they ?¬‚y any other airline in the partnership. When customers
achieve a certain level of points in the program,
all the airlines in the federation begin to provide them
with additional bene?¬?ts, even if a customer had never
?¬‚own that speci?¬?c airline before. Using Information
Cards, a user could obtain services from a website without
having to create an account with that particular website,
as long as it accepted an identity that the user held.
An early experiment in identity federation was the
Microsoft Passport service??”see the sidebar ???Freeing the
???Hostage Identity??™??? in Chapter 2, ???Hints Toward a
Solution.???
Criteria for Selecting an Identity Provider
312 Identity Consumers
Identity Provider Quali?¬?cations
As part of the decision to choose an IP, an organization should
carefully review other quali?¬?cations of the IP.
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