Comprehensive Auditing and Identity-Based Data Outsourcing in Cloud.

computer engineering

More and more clients would like to store their data to public cloud servers (PCSs) along with the rapid development of cloud computing.. When the client is restricted to access PCS, he will delegate its proxy to process his data and upload them. On the other hand, remote data integrity checking is also an important security problem in public cloud storage. It makes the clients check whether their outsourced data are kept intact without downloading the whole data. From the security problems, we propose a novel proxy-oriented data uploading and remote data integrity checking model in identity-based public key cryptography: identity based proxy-oriented data uploading and remote data integrity checking in public cloud .We give the formal definition, system model, and security model. Then, a protocol is designed using the bilinear pairings. The proposed protocol is provably secure based on the hardness of computational DiffieHellman problem. Our protocol is also efficient and flexible. Based on the original client’s authorization, the proposed protocol can realize private remote data integrity checking, delegated remote data integrity checking, and public remote data integrity checking

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