信息安全涉及领域十分广泛 ,本文着重研究网络的信息安全技术 ,分析加密技术、防火墙等多种安全技术的功能、实现方法及优缺点 ,最后展望了信息安全的发展前景。 The information security involves a very wide range of fields. This paper focuses on the information security technology of the network, analyzes the functions, implementation methods, advantages and disadvantages of various security technologies such as encryption technology and firewall. Finally, it forecasts the development prospect of information security.