访问控制是系统安全的关键技术,不同网络环境下的访问控制机制也是不同的.首先对3种传统的访问控制策略加以介绍,给出DAC(discretionary access control),MAC(mandatory access control)和RBAC(role-based access control)各自的特点及应用,并简要介绍下一代访问控制UCON(usage control)模型,然后分别针对网格、P2P、无线网络环境下的访问控制技术及目前的研究现状进行总结,详细阐述可信网络作为下一代互联网发展的必然目标,要求基于可信的访问控制模型保证其安全性,对可信和信誉模型进行了研究,最后给出访问控制技术的发展趋势. Access control is the key technology of system security, and the access control mechanisms are different in different network environments.Firstly, three kinds of traditional access control strategies are introduced, and discretionary access control (DAC), MAC (mandatory access control) and RBAC (P2P) and wireless network, and summarizes the current research status of the access control technologies in grid, P2P and wireless networks respectively It elaborates the credible network as the inevitable goal of the next generation of Internet development. It requires trusted access control model to ensure its security, and studies the credible and reputation model. At last, it gives the development trend of access control technology.