Secure Data and Efficient CP-ABE for Multiserver Cloud Storage

Data integrity checking is main in cloud storage space. It can make the users verify whether their outsourced data is kept intact without downloading the whole data. Some application scenarios, the clients have to store their data on multi-sever cloud. At the same time, the integrity examination protocol must be efficient in order to save the verify cost. Thus a novel remote data integrity checking model: identity-based distributed provable data possession (ID-DPDP) is proposed for a multi-server cloud storage. Based on the bilinear pairing, a concrete ID-DPDP protocol is design. The current paper proposed ID-DPDP protocol is provably protected under the hardness assumption of the standard computational diffie-hellman (CDH) problem. The structural advantages of eliminate the certificate management, the ID-DPDP protocol is efficient and flexible. Based on the user authorization, the proposed Cipher text attributed based encryption (CP-ABE) perform private verification, delegated verification, and public verification.