Secure and Efficient Certificateless Provable Data Possession for Cloud-Based Data Management Systems

摘要

Cloud computing provides important data storage, processing and management functions for data owners who share their data with data users through cloud servers. Although cloud computing brings significant advantages to data owners, the data stored in the cloud also faces many internal/external security attacks. Existing certificateless data provider schemes have the following two common shortcomings, i.e., most of which use plaintext to store data and use the complex bilinear pairing operation. To address such shortcomings, this scheme proposes secure and efficient certificateless provable data possession for cloud-based data management systems. In our solution, the data owners and cloud servers need to register with the key generation center only once. To ensure the integrity of encrypted data, we use the public key of the cloud server to participate in signature calculation. Moreover, the third-party verifier can audit the integrity of ciphertext without downloading the whole encrypted data. Security analysis shows that our proposed scheme is provably secure under the random oracle model. An evaluation of performance shows that our proposed scheme is efficient in terms of computation and communication overheads.