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Trustworthy Assurance of service Interoperation in Cloud Environment

International Journal of Automation and computing 2011年第3期8卷 297-308页

作者： Bing Li Bu-Qing Cao Kun-Mei Wen Rui-Xuan Li State Key Laboratory of Software Engineering Wuhan University Wuhan 430072 PRC School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 PRC School of Computer Science and Engineering Hunan University of Science and Technology Xiangtan 411201 PRC

Cloud computing can be realized by service interoperation and its essence is to provide cloud services through network. The development of effective methods to assure the trustworthiness of service interoperation in cloud environment is a very important problem. The essence of cloud security is trust and trust management. Combining quality of service （QoS） with trust model, this paper constructs a QoS-aware and quantitative trust-model that consists of initial trust value, direct trust value, and recommendatory trust value of service, making the provision, discovery, and aggregation of cloud services trustworthy. Hence, it can assure trustworthiness of service interoperation between users and services or among services in cloud environment. At the same time, based on this model, service discovery method based on QoS-aware and quantitative trust-model （TQoS-WSD） is proposed, which makes a solid trust relationship among service requestor, service provider and service recommender, and users can find trustworthy service whose total evaluation value is higher. Corapared to QoS-based service discovery （QoS-WSD） method, it is proved by the experiment for TQoS-WSD method that more accurate result of service discovery will be achieved by service requestor, while reasonable time cost is increased. Meanwhile, TQoS-WSD method strongly resists the effect of service discovery by untrustworthy QoS values and improves service invocation success-rate and thus assures trustworthiness of services interoperation.

关键词： Quality of service (QoS) trust service discovery service interoperation service invocation success-rate cloud computing.

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