Application Research Of Data Integrity Checking Technology In Cloud Storage

With the rapid progress and development of information technology,the traditional data storage model has been unable to meet the new needs and challenges,cloud storage with low cost and high efficiency has received strong attention from various parties since it born.As a new storage model,the cloud storage's data security receives more and more people's attention,how to ensure that the data which user stores in the cloud server is correctness and completeness is one of the key issues in the development of cloud storage technology.In this thesis,data integrity testing is taken as the research direction,with emphasis on data integrity testing and file auditing and accountability with trusted third parties as the neutral institutions for cloud storage data security.The scheme uses the trusted third-party to instead of the user to perform data integrity testing,checks whether the file is complete correctly and efficiently and releases users from the heavy task of computing.This thesis proposes a data security accountability scheme based on trusted third party.The trusted third party judges the on-line condition and target file permissions of the user in every operation,only the legitimate user can be recongnized by the system,and the operation record is saved in the credential both sides could not deny.When the user and the cloud service provider hold opinions on the data state,they can use the trusted third party to perform data audit and accountability,and solve the problem that when the data files were illegally modified or accidental damage,the user and the cloud can not provide a convincing credential to responsibility distinguish.This scheme reliably and efficiently solves the problem the user can not trace back the abnormal data state.