After extension , new security properties of users , security label and audit mask , are added to the i & a system , in order to support the mandatary access control ( mac ) and audit system under the secure os 扩展后的标识鉴别机制增加了新的用户安全属性，即安全标签和审计掩码，以增加对安全操作系统下强制存取访问控制和审计机制的支持。
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Besides , to enforce the security of authentication process , in this thesis we propose the design and implementation of a passwd checker and mandatary identification and authentication mechanism in ercist 4 . 0 secure operating system 本文还介绍了安胜4 . 0安全操作系统中口令检查器和强身份认证机制的设计和实现，以增强鉴别过程的安全性。
