随着国民经济信息化的迅速发展,企业网络信息系统对安全的要求越来越高,信息系统的安全已经涉及到国家主权等许多重大问题。据美国《金融时报》报道,目前全球平均每5秒就发生一起Internet计算机入侵事件,一些银行、企业、机构都未能幸免。有调查报告指出,近78％的信息主 With the rapid development of informatization of the national economy, the requirements of enterprise network information systems are getting higher and higher. The security of information systems has involved many major issues such as state sovereignty. According to the Financial Times, the current global average of Internet computer incursions occur every 5 seconds and some banks, enterprises and agencies have not been spared. A survey report pointed out that nearly 78% of the main information