网络安全问题并不是一个新问题，它的产生可以追溯到计算机技术发展的各个阶段。我们可以从多个角度来认识网络安全问题的历史由来。 从操作系统发展的角度来看，多用户操作系统其主要目标是为用户提供基于主机的多用户分时管理、计费、资源共享、系统安全技术，特别是安全内核 The problem of network security is not a new issue, and its emergence can be traced back to all stages of the development of computer technology. We can understand the history of cybersecurity issues from multiple perspectives. From the perspective of operating system development, the main goal of multi-user operating system is to provide users with host-based multi-user time-sharing management, billing, resource sharing, system security technologies, especially security kernel