互联网发展自诞生之日起就与风险同行,由E-mail,ftp,网上会话等简单应用发展到现在的电子商务和电子政务,应用越来越复杂,安全问题也呈几何级数增长,黑客和病毒给网络带来了前所未有的挑战,安全产品也从防病毒、防火墙、入侵监测、VPN等单一产品走向整体化,比如防火墙原来更多的设计是如何防范黑客入侵,而现在已经在演变成一个综合安全网关,包括了传统的防火墙功能、防病毒网关、网页内容过滤、VPN等等,入侵监测也由单纯的 Since the birth of the Internet, the development of the internet has gone hand in hand with the risk. E-mail, ftp, online conversations and other simple applications have evolved into the current e-commerce and e-government applications. The applications are becoming more complicated and the security problems are experiencing geometric growth. Hackers Viruses and viruses have brought unprecedented challenges to the network. Security products have also gone from being single products such as antivirus, firewall, intrusion detection and VPN to becoming integrated. For example, how firewalls are more designed to prevent hacking, and now they have evolved into A comprehensive security gateway, including the traditional firewall features, anti-virus gateways, web content filtering, VPN, etc., intrusion monitoring by simple