Research On Multi User Oriented Group Data Integrity In Mobile Cloud Storage

Cloud storage service is a kind of network service mode based on cloud computing,which is widely concerned and used by people because of its low price,high efficiency,convenient and easy to use.Compared with the traditional data storage,cloud storage can effectively avoid the redundant construction of the storage platform,and effectively optimize the allocation of storage resources.Therefore,cloud storage is actually not only storage,but also a kind of storage services.However,due to the cloud storage to make the data out of the physical control of the owner,so the security,reliability and availability of data in the cloud storage services are facing an unprecedented challenge.Data integrity verification of cloud storage security can not only discover the cloud server hardware and software failures,but also find malicious behavior and restrictions of the cloud service provider,so as to effectively improve the quality of cloud storage service.In this paper,the cloud group shared data integrity as the research direction,focusing on how to reduce the computational overhead,client cloud data integrity verification in the group user user fast revocation and group user identity privacy protection problem.On the basis of the existing model of data integrity verification,this paper designs two kinds of data integrity verification schemes according to the above problems:(1)in order to reduce the computational overhead of computing data tags and the rapid revocation of users in the group,a lightweight group data integrity verification scheme is designed.The scheme uses the characteristics of proxy re signature,which originally should be completed in the client's signature work into the third party verifier and cloud server together,which reduces the computational overhead and communication overhead upload label calculation for users;also use proxy re signature,while a user revocation from a group,cloud the server can directly be calculated into user revocation tags existing legitimate user tags,avoid legitimate users downloaded from the cloud data and recalculate the tag overhead.Finally,the security of the scheme is proved by the random oracle model and the proof security theory.(2)to protect the data security of group users in the cloud,a data integrity verification scheme is designed to protect user privacy and support dynamic update.This scheme can efficiently detect the shared data in the cloud storage group,and using the characteristics of ring signature to hide the corresponding data block signature information to protect the identity privacy,namely public verifier in process validation data integrity in the group can not know the identity of the user privacy;through the use of the method of generating data aggregation label,reduce the storage overhead of the label,the dynamic operation at the same time to support the group data,the group data in the group of users can easily modify the cloud.Finally,the security of the scheme is proved by the random oracle model and the proof security theory.