The establishment of cloud computing system can greatly improve the data handling and interacting ability of the electricity network. However, the open operating environment faces significant security challenges. It is very important to effectively determine untrustworthy cloud terminal user so as to ensure the cloud security in complex dynamic environment. In this paper, based on set pair analysis (SPA) theory, we present a convenient method for credibility analysis of power cloud terminal user so as to give the system certain ability to provide differentiated services according to the predefined service policies. Through case study, we demonstrate the effectiveness and simplicity of the SPA-based method.
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