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Three Categories of Request/Response
•Authentication information:
–Request: "please provide authentication info about John Doe (the user)"
–Response: "John Doe was authenticated on ____ (datetime) by the user presenting a password over a protected session.  This authentication info is valid during this ____ datetime."
•Attribute information:
–Request: "please tell me John Doe's credit line"
–Response: "John Doe has a credit line of $5,000"
•Entitlement (authorization) information:
–Request: "Is John Doe entitled to read the employee salaries?"
–Response: "John Doe should be denied read access to the employee salaries"