The Research on Service Composition Trust based on Cloud Computing

Abstract

According to the characteristics of services at multiple levels under cloud computing environment, a modeling mechanism of service composition trust is proposed. Analyzing QoS of sub service, matching it with trust evaluation standard, so the static trust evaluation of sub service is obtained. Processing the existing historical data of service composition, it can get the dynamic trust evaluation of sub service. The mode of service composition is put forward, and the algorithm of service composition trust is designed. The algorithm is based on sub service trust, considering the sub service weights and mode of service composition, has the characteristics of high accuracy and adaptability, and is suitable for application of service composition under cloud computing environment. service composition trust. The service composition trust is higher, user's satisfaction is high. The traditional service composition trust much considers the safety problem, selects sub services according to QoS of sub service, and less considers the difference between theory and practice and mode of service composition, therefore it can not adapt to the cloud computing environment. Sub services often are supplied by different providers and have heterogeneous, exotic characteristics (2), so the trust provided by these sub services is static, unilateral, and different when sub service is used in practices. It is difficult for system to select, match sub service and accurately calculate trust (3). This paper presents a modeling mechanism for service composition trust based on static and dynamic trust of sub services. The mechanism fully considers the mode of service composition and QoS of sub service, gets the trust of service composition by trust algorithm based on the historical data. The mechanism can make trust higher accuracy, and improve user's satisfaction.