Role Based Access Control is a technology that is both new and old. The basic concept of roles has been used for a long time as a means of managing privileges while RBAC models have recently appeared. For the time being there is no regulation that could be called a standard of RBAC however a set of basic requirements and functionality for this type of access control is well defined. Constraints which are used for example to enforce separation of duty are functionality that should be present in each RBAC model, RBAC Modal Model (RMM) is a new proposition based on deontic logic formalism and methods of reasoning automation. This article presents how constraints are defined and managed within RMM.
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