在我国社会主义市场经济高速发展的今天,计算机网络技术已经普及全世界,但随着计算机网络技术的发展,随之而来的网络犯罪、有害信息传播、黑客攻击等问题愈发严重,网络安全环境越来越让人担心。对计算机网络进行安全保护已经刻不容缓,尤其是内部网络的安全防护。内部网络的物理接口遍布建筑物的各个房间,任何黑客都可以通过暴露的物理接口对内部网络进行攻击。文章分析的主要是一种基于数字证书的网络设备身份认证机制,它对保护内部网络的安全性有非常突出的效果。 With the rapid development of socialist market economy in our country, computer network technology has spread all over the world. However, with the development of computer network technology, cybercrime, harmful information dissemination and hacker attacks have become more and more serious. Network security The environment is getting more and more worrying. The security of computer networks has become urgent, especially for the security of internal networks. The internal network has physical interfaces throughout the buildings and any hacker can attack the internal network through exposed physical interfaces. The article mainly analyzes a network device identity authentication mechanism based on digital certificates, which has a very prominent effect on protecting the security of the internal network.