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subject
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... Authorization
The act of determining whether a requesting entity (subject) will
be allowed access to a resource (object).
...
... port unreachable messages as explicit indications that the server is
not reachable, subject to security policy on trusting such messages.
Diameter ...
... end-to-end security are determined by policy on each of the
peers. Security policies, which are not the subject of
standardization, may be applied by next hop Diameter ...