不同的预防性防御措施(图1)可能在防御内部威胁比防御来自计算机黑客的威胁更有效。

Different preventive defensive measures (Figure 1) may be more effective against an insider threat than a threat from a computer hacker.

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本文分析上网涉及的安全问题，介绍了关于密码安全、黑客攻击、病毒破坏诸方面的预防措施。

This article analyses the security problems related to Internet, and then mainly discusses the precautionary measures to protect password, to prevent Internet from hacking and virus damage.

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