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Research On Adaptive Trust Model And Trust-based Application For Open Network Environment

Posted on:2011-10-13Degree:DoctorType:Dissertation
Country:ChinaCandidate:M YangFull Text:PDF
GTID:1228330332982942Subject:Information security
Abstract/Summary:PDF Full Text Request
As the development of Internet and extension of Internet-based applications, systems are translating from closed, user familiar and relatively static form to open, public accessed and dynamic collaborative service model. The application systems bacome flexible, evolutionary, continuously reactive and multi-objective adaptive. The trust problem in open network enviroment becomes the most worthy research field.The concept of trust is introduced into networs, which could used to solve the problem of building trust relationship between cross-organizational entities when they interacting, sharing,collaborating with each other in the distributed, heterogeneous, autonomous and dynamic open network environment. Trust degree could be the measurement to service selection and service scheduling, thus could help improving the trustiness of services.This paper focuses on theoretical problems of trust services in open network environment. By using the theory and technology of the trust model, several researches have been made, incuding the metrics of trust model, the adaptive mechanism of trust model, trust based fault tolerant method in building reliable Web service and Web service selection based on service action. These studies can guide following researches on trust model and could solve the trust problems of services in open network environment. These researches are handed in layers, and are at the inadequate of the recent trust models and trust services. These reaserches have creativity in theory, and they also have theory evidence and technical Value Tin further studies on trust model ans trust services.1. Research on metrics of trust modelThe existing researches of the trust are rarely on evaluation and measure of trust models themselves. Now, there has a systematic metrics management to objectively and quantizedly evaluate the functional differences among all the existing trust models. Aiming this state of trust model field, an concept of trust model metric is proposed, which follows the common research methed of complex questions. An extensible management of evaluation metrics of trust model is given, the design principles are elaborated, and a formal description of trust model is brought out. An evaluation framework of general performance metrics of trust model is proposed, and several typical general performance metrics with corresponding detection algorithm are designed.2. Research on the adaptive mechanism of trust modelIn open network environment, the scale of application system grows from small to large, the constitution of its consumer becomes complex, and the environment it reled on changes from well to malice. But existing researches on designing trust models does not take thses laws into account. Aiming this problem, a nadaptive mechanism of trust model is proposed, which could dynamicly adapt the evolvment of open network. An adaptive algorithm based on muilt-agent PSO is proposed. This adaptive mechanism could apply to the design trust model and to the improvement of existing trust model in application system.3. Research on trust based fault tolerant method in building reliable Web serviceThe existing fault tolerant methods could not dyamicly adjust the number of redundant according to the status of system. Aiming this problem, A trust based fault tolerant method in building reliable Web service was proposed, which is combined trust and fault tolerant. This method finds non-evident errors by using voting protocol. A novel polling mechanism is proposed. A fault-tolerant-number calculating formula is deduced and fault tolerant services selection algorithm is proposed according to the characteristic of the required domain and the non-functional requirement. Experiments show that our method can provider high correctness services in all the three malicious attacks from providers compared to trust based method and other fault tolerant method.4. Research on Web service selection based on service actionThe existing Web service selection algorithm takes the trustiness of service node, which could not find the optimal solution to the web combination path.aiming this problem, a web service selection method based on service action is proposed. The measurement to the trust of service actions is given. Web service selection algorithm based on genetic algorithm is designed. Experiments show that this method is accurate.
Keywords/Search Tags:trust service, trust model, model evaluation, adaptive, evolutionary computation, fault tolerant
PDF Full Text Request
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