Flexible and Efficient Multi-Authorization Data Sharing Scheme With Enhanced Privacy Protection

The advancement of the digital economy relies on secure data sharing. However, most existing methods face challenges like single-points-of-failure, insufficient privacy protection, and low efficiency. To address these issues, this manuscript proposes a multi-authorization ciphertext-policy attribute-based encryption scheme to eliminate single-points-of-failure. The scheme achieves policy hiding using boolean sharing and pseudo-random functions, enhancing privacy protection. It also supports efficient user revocation and policy updates. Considering the constraints of practical environments, this manuscript employs an outsourcing computation and secure ciphertext de-duplication to reduce overhead. The scheme's adaptive security is proven under the standard model, and its performance is validated through simulations. The results demonstrate that this manuscript's scheme outperforms traditional multi-authorization ciphertext-policy attribute-based encryption in security and efficiency, making it ideal for resource-constrained data sharing scenarios.