Being different from the typical definition of RBAC, the core conception role of RBAC was defined as a 4-tuple with tasks. It was pointed out that a task was the basis for analyzing RBAC system.

与典型的RBAC的定义不同，将RBAC的核心概念角色定义为包括任务在内的一个四元组，进而提出任务是分析实现RBAC系统的基础。

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This paper analyzes the administrative model of RBAC and Usage Control (UCON) model, and points out the deficiency of UCON core model.

本文分析了多种主体之间的相互关系，针对隐私保护问题提出了可管理的使用控制模型。

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