At present, cloud computing is developing rapidly, and trust management is one of the most challenging problems to the sustainable development of cloud computing. The highly dynamic, distributed, and non-transparent nature of cloud computing introduces several key issues such as privacy, security, and availability. Protecting cloud services providers against attacks from malicious users is also a difficult problem. Based on the design of the cloud computing trust management, this paper introduces a method to calculate users’ evaluation credibility which uses the calculated trust results as the credibility weights of the evaluation evidences. Users are generally divided into two kinds, one kind is the normal user who gives the credibility evaluation according to the actual transaction situation, and the other is the malicious user who attacks the service entity by submitting malicious evaluation. By calculating the evaluation credibility of the user, the method can identify the malicious user entity and protect the trust management model. In this paper, the experiment is based on the real trust feedback in cloud computing, which eliminates malicious user according to the user’s evaluation credibility. The feasibility of the model is proved by using the normal user feedback.
