Research On Multi-replica Provable Data Possession Under Cloud Computing

Cloud storage service,a computing service for large amounts of data storage and manage?ment,has brought convenience to many enterprise users and individual users.However,uploading data from local to the cloud storage server may bring potential threats to data security and integrity.In the current research,to protect the security of the user's data,the data should be encrypted.Then,the user computes the tag of the data which is to be uploaded to the cloud.At last,the user uploads all the data and tags to the cloud.When the user doubts the integ:rity of his cloud data,he can challenge the cloud storage server and get response from the server,and then he can judge the integrity of his cloud data by comparing the response and tag.However,these schemes do not consider the actual storage of replica on the cloud,and do not support the application requirements for the dynamic updating of data,and have potential threat of public verification.To solve these problems,this thesis proposes a provable data possession scheme based on bilinear mapping,which uses proxy re-encryption technology to support the third party au-dit.In this scheme,the cloud storage server uses its,own rules to store users,data,and the integrity checking task is done by the third party by using the proxy re-encryption key which is generated by the user.At last,this thesis is also support the dynamic updating of data.In the subsequent comparison test,the proposed scheme is more efficient in the data integrity verification phase.