Research on Blockchain-Based Fine-Grained Cloud Data De-Duplication for Secure Storage in Untrustworthy Environments

This research adopts ciphertext policy + attribute-based encryption outsourcing data based on elliptic curve to achieve fine-grained access control mechanism. In the face of untrustworthy third-party organisations, it proposes to achieve publicly verifiable data integrity based on the decentralisation of blockchain, smart contract emerging technology. The framework has the characteristics of traceability and verifiability, and the theoretical research and experimental results show that the framework has better security and can meet the demand of cloud data sharing.