Identity-Based Distributed Provable Data Possession in Multi-Cloud Storage
Remote data integrity checking is of crucial importance in cloud storage. It can make the clients verify whether their outsourced data is kept intact without downloading the whole data. In some application scenarios, the clients have to store their data on multi-cloud servers. At the same time, the integrity checking protocol must be efficient in order to save the verifierÃƒÂ¢Ã¢â€šÂ¬Ã¢â€žÂ¢s cost. From the two points, we propose a novel remote data integrity checking model: ID-DPDP (identity-based distributed provable data possession) in multi-cloud storage. The formal system model and security model are given. Based on the bilinear pairings, a concrete ID-DPDP protocol is designed. The proposed ID-DPDP protocol is provably secure under the hardness assumption of the standard CDH (computational Diffie- Hellman) problem. In addition to the structural advantage of elimination of certificate management, our ID-DPDP protocol is also efficient and flexible. Based on the clientÃƒÂ¢Ã¢â€šÂ¬Ã¢â€žÂ¢s authorization, the proposed ID-DPDP protocol can realize private verification, delegated verification and public verification.