Discretionary Access Control is one of necessary and most common secure mechanisms in the secure operating system.
自主访问控制机制是安全操作系统必不可少的、应用最广泛的安全机制之一。
Discretionary access control (DAC) is the kernel of most protection mechanism, and the research on safety of DAC concerns whether rights can be leaked to unauthorized subjects.
自由访问控制(DAC)是大多数操作系统保护机制的核心，DAC的安全性研究关注对象的权限是否被泄漏给未授权主体。
The NSA found that most operating systems' security mechanisms, including Windows and most UNIX and Linux systems, only implement "discretionary access control" (DAC) mechanisms.
NSA发现大部分操作系统的安全机制，包括Windows和大部分UNIX和Linux系统，只实现了“选择性访问控制(discretionary access control)”(DAC)机制。
Before 1970, in order to protect the information security in computer systems, mandatory and discretionary access control policy had been widely applied in secure computer systems.
在上世纪七十年代以前，为保证计算机系统中的信息安全性，自主存取控制和强制存取控制策略在计算机多安全级系统中得到了广泛的应用。
To keep independent object-oriented system secure from Trojan horse, there exists already a restrictive policy that blends information flow control with discretionary access control.
描述了面向对象系统的数据模型，研究了信息流和信息传输，并以此为基础给出了基于自主访问控制策略的分布式对象系统的信息流控制方法。
This paper chooses and realizes the privilege system role-based based on the further research between discretionary access control, mandatory access control and role-based access control.
论文在对自主访问控制、强制访问控制和基于角色的访问控制的访问控制策略及机制分析、研究基础上，选择并实现了基于角色的权限管理系统。
Fine-granularity discretionary access control based on Access Control List (ACL) may grant authority to one user or group, but it may grant unapt authority or remove authority not timely.
基于访问控制表（ACL）的细粒度自主访问控制机制可以实现针对单个用户或用户组的访问授权，但是在实际使用中可能造成不适当授权或权限撤销不及时的缺陷。
Introduced the outer role, inner role and basic role, the model can not only realize Discretionary Access Control but also the Mandatory Access Control. In addition, it can facilitate the management.
引入了外部角色、内部角色和基本角色，使得该模型可以同时实现自主访问控制和强制访问控制，而且也方便了管理。
Introduced the outer role, inner role and basic role, the model can not only realize Discretionary Access Control but also the Mandatory Access Control. In addition, it can facilitate the management.
引入了外部角色、内部角色和基本角色，使得该模型可以同时实现自主访问控制和强制访问控制，而且也方便了管理。
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