Recent years have witnessed the development of cloud computing. However,there also come some security concerns in cloud computing environment, suchas emerging network attacks and intrusions, and instable cloud service provision dueto flexible cloud infrastructure and resources. To this end, we research on the trustedcomputing in cloud computing environment. Specifically, in this paper, we proposea trust model based on virtual machines, with two considerations. First, we introducetimeliness strategy to ensure the response time and also minimize the idle timeof servers. Second, we extend the linear trust chain by differentiating the trust ofthe platform domain and user domain. Besides, we develop a fuzzy theory basedmethod to calculate the trust value of cloud service providers. We also conduct someexperiments to evaluate our method.
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