??? In that instance, the two entities were a
company and its hardware supplier. The hardware supplier was
offering access to its web store (the ???resource???) to the employees
of the ?¬?rst company. The two formed a federation.
WS-Federation builds on top of WS-Trust and WS-Security, organizing
the primitives offered by those speci?¬?cations in a
higher-level language suitable for modeling systems such as the
example just mentioned. In practical terms, given a certain
topology of clients, services, and STSs, WS-Federation establishes
the sequences of messages that must be exchanged
among the various parties for obtaining a certain result. In our
simple example, the result is an employee of the ?¬?rst company
accessing the web store offered by the hardware vendor, but
WS-Federation is expressive enough to solve much more complex
scenarios such as multicompany single sign-on. WSFederation
describes how to deal with those scenarios in
synergy with other WS-* speci?¬?cations. The case in which the
actors are web services is described as the active requestor
case. A requestor is active because, being web service capable,
you can expect it to be able to use cryptography on the messages
emitted and show off the ownership of keys.
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