Research On Key Technologies Of Cloud Storage Data Integrity Verification

In the Internet era,the variety of data generated by users is increasing.Due to the limitation of local storage space,users choose to outsource data to cloud storage server.Outsourced storage lets users to give up actual control over the data.In a complex cloud storage environment,cloud servers do not actively report incidents of storage server corruption to users in order to maintain their reputation,and even delete users' long-term unused data in order to save storage overhead.So remote integrity verification is used to ensure data integrity on the cloud server side.At the same time,since the user needs to update the stored data in time,the remote integrity verification needs to be able to support the dynamic operation of the data.The existing scheme can support data update dynamically,but there are also some problems such as inefficient calculation and large communication overhead.In view of the shortcomings of existing solutions,this dissertation is committed to support dynamic update cloud storage data integrity verification research to achieve efficient remote verification and update.The main contribution of this dissertation is as follows:(1)Based on the purpose of privacy protection and support for dynamic update,a cloud storage data integrity verification protocol supporting dynamic update is designed.The protocol supports data dynamic update by introducing an authentication structure that supports root node verification,and implements data privacy protection through a random mask.(2)Aiming at the defect that the existing scheme auxiliary information is too large and does not support concurrent update,a RMHT-based integrity verification scheme is proposed.First,a multi-block concurrent integrity verification protocol is designed,which can complete the integrity verification of multiple blocks with low auxiliary information.Second,this paper proposes a concurrent multi-block update protocol to implement an update to conduct the update of multiple data blocks at the same time.(3)Aiming at the deficiencies of RMHT verification and update process,an MLBT-based integrity verification scheme is proposed.First,improve LBT to MLBT for public verification,and design multiple a concurrent audit protocol to achieve efficient auditing.Second,based on MLBT,a continuous multi-block update scheme is proposed to reduce the degradation of structure.