Formal analysis of power separation mechanism based on Biba model

Mandatory access control is a necessary condition for constructing a high level of security information system. In this paper, based on Biba model, we give formal analysis for power separation mechanism under the condition which administrators are divided into system administrators, security administrators and security auditors,through the analysis,we give the conditions of guaranteeing the security of the information system management under separation of the three powers management mechanism.The results of this paper have been applied to the construction of a national information system.