由于现代社会对通信和信息网络的依赖性愈来愈强，信息系统和信息资源的安全问题备受国家和社会的关注，“信息安全＂已成为经常使用的名词。信息安全保障能力是２１世纪综合国力、经济竞争实力和生存能力的重要组成部分 ,因此我们必须在进一步提高认识的基础上跟踪世界信息技 Due to the growing dependence of modern society on communication and information networks, the security of information systems and information resources has drawn the attention of the state and society. “Information security” has become a frequently used term. Information security capability is an important part of our comprehensive national strength, economic competitiveness and viability in the 21st century. Therefore, we must follow up the World Information Technology