21世纪全世界的计算机都将通过Internet联到一起,信息安全的内涵也就发生了根本的变化。它不仅从一般性的防卫变成了一种非常普通的防范,而且还从一种专门的领域变成了无处不在。当人类步入21世纪这一信息社会,网络社会的时候,我国将建立起一套完整的网络安全体系,特别是从政策上和法律上建立起有中国自己特色的网络安全体系。从当今社会的通信网络应用背景出发,描述了通信网络安全的重要性,分析了其面临的问题和所采用的安全维护技术。 In the 21st century, all the computers in the world will be linked together through the Internet, and the connotation of information security will fundamentally change. Not only has it changed from a general defense to a very ordinary one, it has also evolved from a specialized field to a ubiquitous one. When mankind steps into the information society and online society in the 21st century, our country will establish a complete network security system, in particular, establish a network security system featuring China’s own policies and laws. From the background of communication network application in today’s society, the importance of communication network security is described, the problems it faces and the security maintenance techniques adopted are described.