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【正文】 Ravi Sandhu WorldLeading Research with RealWorld Impact! 11 will not impact implicit membership o After removal from CSD, user still inherits attribute of CSD through G. will remove both explicit and implicit memberships o User will be removed from G, if removed from CSD and authorized by rules. USER ? Weak Removal versus Strong Removal GURAG Model Extensions 169。 Ravi Sandhu WorldLeading Research with RealWorld Impact! 4 U: User UG: UserGroup S: Subject UA: User Attributes O: Object OG: ObjectGroup OA: Object Attributes OP: Operation (Actions) ? [Servos et al] proposed Hierarchical Group and Attribute based Access Control (HGABAC) operational model ? Introduces the notion of User and Object Groups ? Core advantage is simplified administration of attributes ? User and Objects are assigned set of attributes in one go as pared to single assignment at a time. Example UserGroup Hierarchy 169。05] ? Guide to ABAC Definitions and Considerations [NIST SP 800162] ? etcetera!! Attribute Based Access Control (ABAC) 169。 Ravi Sandhu WorldLeading Research with RealWorld Impact! 9 EXPR(UA ∪ UG) in UGA: Example UGA canAssign rules: Example UGA canRemove rules: studI
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