Research on controllability of internet information content security

Traditional information security models focus on protecting information or information systems. There is little research on controllability of information content security. We present the network reference monitor (NRM) for access control in Internet environment firstly. Then we propose the definition of network reference monitor and Internet information access control. Abstract operation model is put forward for controllability of content security access control. The model consists of three parts: information discovery model, information analysis model and information control model. Next, we express the intuitive formal specification of controllability by PCTL logic. Then we characterize the process of Internet access control by finite state automata and present an evaluation model of controllability to analyze access control of information content security quantitatively.