Abstract
RBAC model supports the principle of least privilege by the appropriate combination of roles assigned to users. However, the minimum role set is hard to find. Role hierarchy and inheritance can result in aggregating lots of permissions. To solve this problem, previous work mainly studies the approximate least privilege set by trying to find the minime role sets. However, to reduce the unnecessary privileges is another key issue to solve the problem. To this aim, the concept of task is taken as a kind of constraints introduced to the RBAC model, which contains four constraint rules that can flexibly control the permission inheritance and role activations. An example is showed the four rules can effectively be used to reduce redundanct permissions.
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