引 言 现在处于网络时代,互联网越来越普及,它既是信息传输和处理的媒介,又是信息和资料的海洋,人们利用它可以得到所需的信息和资料,为自己服务。但是,互联网作为一个功能强大的媒体,无论对个人,还是对团体或组织,它实际上是一个双面刃的东西,它既可以作为有效的传媒工具,作正面的媒体宣传和导向,也可能被敌对势力所利用,成为传播反动言论和思想的武器,起到很大的破坏作用。因此,如何扬长避短,发挥网络的正面作用,成为人们关注的焦点,基于网络中的网页内容和邮件内容的信息安全技术研究,已经成为信息安全的一个重要研究分支,它的重要性也越来越被人们所认识。另外,在网络中,也存在很多垃圾,防止垃圾的污染,也是网络安全的课题之一。 本文简要地论述基于内容的信息安全的理论基础、技术支持和研究现状,并对网页的信息安全和电子邮件的信息安全作了分析。 I. INTRODUCTION Nowadays, in the age of Internet, the Internet is becoming more and more popular. It is not only a medium for information transmission and processing, but also a sea of ​​information and information. People can use it to obtain the necessary information and information and serve themselves. However, as a powerful media, the Internet is actually a two-sided matter both for individuals and for groups or organizations. It can serve as an effective media tool, as a positive media outlet and guide, or as a Used by hostile forces, it has become a weapon to spread reactionary remarks and ideas and has played a significant role in destroying it. Therefore, how to avoid weaknesses and play a positive role in the network has become the focus of attention. Research on information security technology based on web content and email content in the network has become an important research branch of information security and its importance has become increasingly important Be recognized by people. In addition, in the network, there is also a lot of trash to prevent garbage pollution, but also one of the topics of network security. This article briefly discusses the theoretical basis, technical support and research status of content-based information security. It also analyzes the information security of web pages and the information security of e-mail.