Abstract
Cloud storage provides clients with flexible, dynamic and cost effective data storage service. This new paradigm of data storage service, however, introduces new security challenges. Since clients can no longer control the remote data, they need to be convinced that their data are correctly stored in the cloud. Moreover, supporting dynamic data updates is a practical requirement of cloud storage. It is imperative to provide an efficient and secure dynamic auditing protocol to check the data integrity in the cloud. In this paper, we first analyze the dynamic performance of some prior works and propose a new Dynamic Provable Data Possession (DPDP) scheme. We introduce a secure signature scheme and the Large Branching Tree (LBT) data structure in our scheme. LBT structure simplifies the process of updates and the signature scheme is used to authenticate both the value and the position of data blocks, which greatly improves the efficiency in communication. The security and performance analysis show that our DPDP scheme is provably secure and efficient.
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