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中文摘要：
针对现有RBAC委托模型在支持细致委托粒度和权限传播的可控性上存在的不足，提出了量化角色的概念，实现了一种细粒度的委托约束机制，给出了一个形式化的基于量化角色的可控委托模型QBCDM（Quantifiedrole Based Controllable Delegation Model）．该模型提供了灵活的委托粒度，支持对角色任意部分权限的委托，避免了引入较高的管理代价；支持强制委托约束和细粒度的自主委托约束，保证了多步委托过程中委托能力的收敛性，显著增强了委托过程的可控性．
英文摘要：
Delegation is an important secure policy that RBAC should support. Most Existing RBAC delegation models cannot effectively support fine delegation granularity and controllable propagation of permissions. This paper first introduces the concept of quantified-role and then proposes a fine-grained delegation constraint mechanism. Lastly, it gives a formal Quantified-role Based Controllable Delegation Model （QBCDM）. The model supports the delegation of any part of permissions of roles, while avoiding incurring high administrative cost. It also provides mandatory constraints and fine-grained discretionary constraints, which ensure the constringency of delegation ability in multi-step delegations and significantly enhance controllability of delegation.
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