The Research Of Dynamic Trust Model On Cloud Computing Platform

Cloud computing is a new business computing technology based on distributed computing, parallel computing and grid computing. It was pursued by all the industries of IT as soon as proposed, and was then researched and developed by large-scale companies such as Microsoft, IBM, Amazon and Google, that has won gratifying results. Cloud computing changes computer's usage mode thoroughly after it was proposed.Distinct from distributed computing greatly, cloud computing uses the business model separating producer and consumer to serve users, and adopts new virtualization technology to provide abundant resources on the "cloud", in order to satisfy users' demands for quality of service as much as possible. But cloud computing environment needs super large scale distributed computing service to support, simple traditional safety techniques have could not satisfy users'demand for data safety. How to ensure the data safety in the "cloud" becomes the core mission to solve the reliability of the cloud computing platform. Recently more and more users and scholars begin to pay more attentions on security and reliability of the cloud computing platform. This paper considered it a good choice to take trust mechanism which is a hot topic into cloud computing. Trust model is abstracted and summarized based on trust relation in society, which has become a major branch in the information safety field. But the research of trust model is still at an early stage, many problems need to be researched and discussed deeply. This paper studies dynamic trust model's application on cloud conputing platform in deep according to the correlation properties of the cloud computing.This paper launches further research based on generalizing merit and demerit of Classic trust model especially CBTM(Cloud-Based Trust Model), and designs a new dynamic trust model suiting Cloud computing platform called DWTrust (Dynamic Window Trust). It is a comprehensive trust model which combines local trust with global trust. The biggest difference from CBTM is that the DWTrust brings dynamic trust mechanism, and discuss the trust properties of cloud computing platform from microcosmic level. The mission of the DWTrust is to estimate the trust relation between nodes of cloud computing environment, and assist nodes to make the trust decision according to the estimated results. This paper combines local trust with global trust and produce advantages respectively to improve credible level of cloud computing environment. At the end of the paper, the simulation test proves that it is effective to enhance the cloud computing platform's credibility using DWTrust trust model.