This paper presents the current situation of network security, then raises four types of security threats on network, finally, the author sets forth some measures to solve network security.

文章先对网络安全现状作一介绍，然后阐述网络面临的四种主要安全性威胁，并针对网络安全性提出了相应措施。

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In the first part, Schneier establishes a context for the topic of digital security by discussing threats, types of attacks, adversaries (i.e., "bad guys"), and the needs for true security.

在第一部分中，Schneier通过讨论所面对的威胁、攻击的类型、对手(比如，恶意破坏者)和安全的需要，为数字安全这个主题建立了一个上下文。

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This paper introduces the common types of network security threats and discusses how to build safe and efficient network systems.

本文介绍了网络安全中常见的几类安全威胁，以及如何建立一个安全高效的网络系统进行探讨。

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The fact that there are so many types of security threats makes it difficult for small firms to protect themselves.

WSJ: Hackers New Target: Small Firms With Lax Security

We also intend to mitigate the impact of binational disasters on communities by establishing procedures to manage land and maritime traffic in the event of a border area emergency, and enhance our collective preparedness for security threats of all types -- health, chemical, biological, radiological, nuclear, and explosive.

WHITEHOUSE: The White House