0引言在最近几年,计算机的应用已经非常普遍,在我们生活中哪里都能看到计算机的应用。它已经成为我们生活、工作非常重要的一个方面,同时,计算机对社会的进步和发展,有了很大帮助。但是它在为我们生活带来方便的同时也产生了很多不好的影响,各式各样的的信息遍布网络,甚至国家的某些机密信息也出现在了网络上,传播这些信息不只会对我们的生活有很大的影响,并 0 Introduction In recent years, the computer application has been very common, in our lives where to see the computer applications. It has become a very important aspect of our life and work. At the same time, computers have greatly helped the progress and development of society. But it has brought a lot of bad influences to our life at the same time. A great variety of information spread all over the internet. Even some confidential information in the country appears on the internet. The spread of this information not only affects Our lives have a huge impact, and