There are constantly changing standards for APIs, gateways, security methods, screens, operating systems, and browsers.

网关、安全性方法、屏幕、操作系统和浏览器的标准经常改变。

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At last, main intrusion methods and security compromization targeted at information systems are discussed.

最后，论述了在网络环境中主要采用入侵手段以及信息系统面临的主要安全威胁。

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However, with the limitations of traditional software development methods, the security and reliability of Operating Systems cannot be very well supported.

而采用传统的软件开发方法开发的操作系统，系统的安全性和可靠性得不到很好的保证。

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