Access control becomes a research hotspot in the multitudinous security mechanism, whose goal is to prevent invasion of illegal users or illegal usage of the system resources by legitimate users.
访问控制成为众多安全机制中的一个研究热点，目标是防止非法用户侵入或者合法用户对系统资源的非法使用。
As an important mechanism in security services, access control can protect system resources from invalid usage.
访问控制是安全服务中一种重要的机制，它能够保护系统资源免遭非法使用。
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