| Cloud computing is a hot technique and has quickly developed in recent years. Though Internet, it renders geographically and widely distributed network resources become a virtual computer, and thus offering cloud users a set of application services. By cloud computing technology, users can make full use of idle processing power, to handle relatively large computational tasks. However, the dynamic and uncertainty characteristics of cloud environment bring about a series of security problems. In cloud system, users and resource entities belong to different virtual groups, the quantity is huge and dynamic, and different virtual groups have different security mechanism. The traditional security mechanisms focus on authentication, privacy, integrity and so on.Since the tasks in the cloud are completed by a number of network nodes, security threats are from the inner system. Thus, it is necessary to build a trust management model to evaluate the user’s behavior, reflecting the user’s trust in the cloud. On the basis of current cloud security problems and their corresponding methods, as well as the fuzzy and dynamic characteristics of trust and trust relationship, this paper proposes a Trust Management model based on Fuzzy set for Cloud environment——TMFC model.The content of this paper includes three parts. First of all, using fuzzy set theory to evaluate trust, does not only meets the fuzzy characteristic of trust itself, but also provides cloud users more reasonable and direct results of trust evaluation. Moreover, it is equipped dynamic feedback mechanism, both accords with the dynamic characteristic of trust, and addresses the fake recommendations from single node. Lastly, the model has recommendation similarity mechanism, to some extend copes with cooperative cheats from middle nodes in the cloud environment. At the end of the paper, the simulation test proves that it is effective to enhance the cloud computing platform’s credibility using TMFC model. |
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