Abstract
Certificate-based cryptosystem can not only resolve the private key escrow problem inherent in the identity-based cryptosystem but also reduce the cost of public key certificate management in the public key infrastructure-(PKI-) based cryptosystem. Provable data possession (PDP) can ensure the integrity of users’ data stored in the cloud at a very high probability. By combining these two concepts, we propose a certificate-based PDP scheme. We prove that our scheme is secure in the standard model assuming that the Squ-CDH problem is hard. Based on the index logic table, our scheme can be extended to support dynamic operations easily. Efficiency analysis shows that our scheme has high efficiency.
Highlights
With the rapid development of the cloud storage technology, more and more users and companies store their data in the cloud
Based on the assumption that the Square Computational Diffie–Hellman (Squ-CDH) problem is hard, we prove the security of our scheme in the standard model
Wang et al.’s scheme [7] supports public verification, that is, users themselves need not check whether their data are stored intact in the cloud; instead, they can delegate a third party auditor (TPA) to do it. erefore, the users’ burden is reduced, and TPA or users can afford evidence when a dispute occurs
Summary
With the rapid development of the cloud storage technology, more and more users and companies store their data in the cloud. Wang et al.’s scheme [7] supports public verification, that is, users themselves need not check whether their data are stored intact in the cloud; instead, they can delegate a third party auditor (TPA) to do it. E certificate-based cryptosystem can resolve the private key escrow problem and reduce the cost of public key certificate management, making it much superior. In 2015, Wang and Li [11] first proposed a certificate-based PDP scheme, but it supports neither public verification nor dynamic operations. In 2020, Wang et al [12] proposed a lightweight certificate-based PDP scheme, which supports both private and public audits, but it does not support dynamic operations. Wang et al [16] proposed a public and dynamic PDP scheme, but it is based on the PKI technology, which requires high cost of certificate management.
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