Blockchain-based and multi-authority hierarchical access control data sharing scheme

As cloud computing technology advances, the demand for data sharing through cloud platforms is increasing. However, existing approaches suffer from limitations in granularity and flexibility. Ciphertext Policy Attribute-Based Encryption (CP-ABE) is commonly used for access control, but single-authority systems pose a risk of single point of failure. To address these challenges, we propose a blockchain-based and multi-authority CP-ABE hierarchical access control method. This approach provides precise control over data access through hierarchical access control and mitigates risks by introducing multiple authorities. Additionally, blockchain technology ensures secure and reliable documentation of access control procedures, enhancing system security and credibility. We formally prove the security of the proposed method and evaluate its performance through simulated experiments. The results demonstrate efficient data sharing, access management, and data security.