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In a traditional cloud storage system, users benefit from the convenience itprovides but also take the risk of certain security and privacy issues. Toensure confidentiality while maintaining data sharing capabilities, theCiphertext-Policy Attribute-based Encryption (CP-ABE) scheme can be used toachieve fine-grained access control in cloud services. However, existingapproaches are impaired by three critical concerns: illegal authorization, keydisclosure, and privacy leakage.  To address these, we propose a blockchain-based data governance system thatemploys blockchain technology and attribute-based encryption to prevent privacyleakage and credential misuse. First, our ABE encryption system can handlemulti-authority use cases while protecting identity privacy and hiding accesspolicy, which also protects data sharing against corrupt authorities. Second,applying the Advanced Encryption Standard (AES) for data encryption makes thewhole system efficient and responsive to real-world conditions. Furthermore,the encrypted data is stored in a decentralized storage system such as IPFS,which does not rely on any centralized service provider and is, therefore,resilient against single-point failures. Third, illegal authorization activitycan be readily identified through the logged on-chain data. Besides the systemdesign, we also provide security proofs to demonstrate the robustness of theproposed system.

Blockchain-enabled Data Governance for Privacy-Preserved Sharing of Confidential Data