RBAC - Role-Based Access Control
RBAC or Role-Based Access Control is a type of access control models. This model makes the access control implementation easier. Groups or roles are created and the access is defined for each group/role. Users are then assigned to the appropriate role, thus the proper access is granted to the user based on the role assigned.
Instead of having to define or assign each access to each individual user, this approach has greatly reduce the effort to manage the access control.
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A 4D-Role Based Access Control Model for Multitenancy Cloud Platform is just too... mathematical...