Verifiable Key Computation Scheme Based on Zero-Knowledge Proof in MA-CPABE

Abstract

In order to eliminate the reliance on centralized authoritiesthe MA-CPABE ciphertext access control scheme based onblockchain technology has become acurrent researchhotspot, However, the existing solutions still face challengesin terms of blockchain scalability and verifiable security.Therefore, this paper proposes a verifable key calculationscheme based on zero-knowledge proof, aiming to achieve aneffcient and verifiable new type of MA-CPABE access controlscheme. Firstly, during the process of generating the user'sprivate key on the blockchain node, computationally intensiveoperations such as public and private key calculation, hashcalculation, and point addition are performed off-chain,achieving the functions of key generation and distributionSecondly, with the aid of the non-interactive zero-knowledgeproof system, the correctness of the off-chain calculationresults is efficiently verified on-chain to ensure the reliabilityand transparency of the key generation process. Finally, thispaper conducts a comprehensive analysis of the scheme fromthree aspects: security, off-chain computing efficiency, andon-chain cost, The simulation experiment results show thatthe scheme proposed in this paper can achieve trusted keygeneration and distribution in MA-CPABE, reduce the onchain computing overhead,and ensure theexecutionefficiency of the CPABE scheme. It provides a new solution forblockchain-based ciphertext access control.