随着计算机网络的普及和应用的扩展,网络安全问题日益突出。本文从网络安全的现状出发,系统地讨论了密码学在网络安全中的作用、网络的各种安全漏洞、以用户鉴别和防火墙为代表的网络安全技术以及网络安全研究中的最新动向。一、网络安全概述数据在计算机网络传输的过程中可能会遭到破坏、更改和泄露。例如:由于人们最初想把Internet设计成便于自由交换信息的开放系统,所以TCP/IP协议套本身存在许多安全漏洞,在以太网、FDDI等广播 With the popularity of computer networks and the expansion of applications, network security problems have become increasingly prominent. Based on the current situation of network security, this paper systematically discusses the role of cryptography in network security, various security vulnerabilities in the network, network security technologies represented by user authentication and firewall, and the latest trends in network security research. First, the network security overview Data in the process of computer network transmission may be damaged, altered and leaked. For example, because people originally wanted to design the Internet as an open system for exchanging information freely, there are many security holes in the TCP / IP protocol suite itself. In Ethernet, FDDI and other broadcasts