操作系统的安全是信息系统安全的基石，访问控制则是操作系统安全机制的重要内容。
The secure operating system is the base of information system security, and access control is a significant secure mechanism of operating system.
多数操作系统安全机制要求每一段代码都必须完全受信任(网页的脚本可能除外)，然后才可运行。
Most operating system security mechanisms require that every piece of code must be completely trusted in order to run, except perhaps for scripts on a Web page.
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