ZK-CPABE: blockchain-based CP-ABE scheme via zero-knowledge proof

The integration of blockchain technology with Ciphertext-Policy Attribute-Based Encryption (CP-ABE) has addressed key challenges in distributed systems, such as mutual trust and collusion, while enhancing auditability of key management. However, existing blockchain-based CP-ABE models face a trilemma, unable to achieve decentralization, scalability, and security concurrently. Therefore, we propose ZK-CPABE, which merges Zero-Knowledge Proofs with blockchain-based CP-ABE, significantly improving verifiability and scalability. This system combines a secure private key distribution and zero-knowledge proofs to construct off-chain computation and scalable transactions for CP-ABE. Our Ethereum-based ZK-CPABE prototype demonstrates its effectiveness and potential for secure, scalable data sharing and access control.