Public Auditing and Secure Deduplication of Dynamic Data Based on Blockchain

With the prevalence of distributed network storage services, the security and dynamicity of cloud storage data have become essential focuses of attention. Meanwhile, research on secure deduplication, integrity audit, and dynamic operations has been extensively conducted. However, in existing research, many data deduplication schemes supporting auditing focus on static file storage. This paper proposes a blockchain-based dynamic data deduplication scheme that supports public auditing, enabling data’s dynamic operations. In addition, the existing proof of ownership is designed only to meet the needs of the server. Therefore, we adopt BLS short signature to design a secure and efficient bidirectional proof of ownership mechanism, supporting the server and client to prove they have the same data. Based on this, we design a multi-server storage mechanism under the supervision of blockchain, which achieves public auditing without a trusted third party and supports block-level deduplication within a server and file-level deduplication across servers. Finally, we demonstrate the feasibility and performance of the proposed scheme through experimental analysis.