The Research Of Trust Evaluation Based On User Behavior In Cloud Computing

With the rapid development of Cloud Computing,reveals the core of Cloud Computing is thatcloud is network, it has become one of the hottest technical in the world. The appearance of CloudComputing makes the current information industry change with the generate of net-style industryand service; The utilization of computing resources improved greatly because of Cloud Computingresources. It will effectively improve the knowledge of humanity and the ability of society transformaswell makeprofoundand castinginfluenceofeconomicdevelopment andsocietyprogress.Cloud Computing link up large amount of data to consist of a super-large scale sharked virtualresource pool, which is greatly facilitate the usage of resource for cloud user, decrease the consumeexpend of the storage resource’s usage. But it will lead to the taut that the core private data of anyenterprise and individual will be utilized by user in the network, also provide readily exploitableloopholes to the unlawful users who is meant destroy the cloud resource. These remarkableadvantage and hazard makes the security issues the major event to be settle, trust issues in theprocess of multi-tenant access even is the priority among priorities. As for the cloud security, at thesame time of user identity authenticity verification, trust evaluation to the users’ behavior. Althoughauthenticationverification cannotprevent thedamage ofhostileattack to cloudresources completely.Therefore, it is the key to improve cloud security that analysis and evaluation of users’ behavior,isalsoa keypoint ofcloud computingstudy.Aim at above problems, this text conduct subject study based on user behavior trust evaluationunder Cloud Computing environment. This text in allusion to the merit and demerit of objective andsubjective synthetic approach, propose combination weighting approach based on relative entropy tocalculate the weight of users’ behavior: combine the weight information of objective and subjectivesynthetic approach,calculate the close degree of objective and subjective approach by relativeentropy, determine weighting coefficient of the weight from every weighting method in combinedweight,then get users’ credit score by apply fuzzy comprehensive assessment on combined weightverification result makes this model come true, indicate the scientificity and operability ofcombinationweighting approachas wellas evaluateuser’s creditscoreobjectively. The main research achievement in this project is:1. Set up the trust evaluation model based on user behavior in Cloud Computing environment.2. Proposed combination weighting approach based on relative entropy, use relative entropy to handle the objective and subjective weight to get the combine weight, measure the close degree between combination weighting approach with objective and subjective weight to get the reliability of objective and subject weight.3.Work out objective evaluation of users’ behavior credibility by the use of fuzzy comprehen--sive assessment.