Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In role based access control, the role hierarchy defines an inheritance relationship among roles. For example, the role structure for a bank may treat all employees as members of the ‘employee’ role. Above this may be roles ‘department manager’, and ‘accountant’, which inherit all permissions of the ‘employee’ role, while above ‘department manager’ could be ‘savings manager’, ‘loan manager’.RBAC models generally treat the role hierarchy as either a tree (set theory), as in the 1992 RBAC model of Ferraiolo and Kuhn, or a partially ordered set in the 1996 RBAC framework of Sandhu, Coyne, Feinstein, and Youman. In object oriented programming terms, the tree role hierarchy is single inheritance, while the partial order hierarchy allows multiple inheritance. When treated as a partial order, the role hierarchy example given above could be extended to allow a role...

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