A Revocable and Key Secure Ciphertext-Policy Attribute-based Encryption Scheme Based on Blockchain
Xingyu Zhou, Wenmin Li, Huimin Zhang · 2024
Amidst the surge in privacy breaches in the era of big data, individuals are increasingly concerned about the security of their personal information. This paper centers its research on personal privacy data in the realm of big data, specifically focusing on CP-ABE. The proposed Blockchain-based User Revocation-CPABE (BUR-CP-ABE) scheme enhances distributed security by integrating blockchain and smart contract technologies. Using smart contracts for managing user lists and employing searchable encryption algorithms to protect on-chain data privacy enable flexible user revocation. To address key leakage concerns, the key fragmentation approach divides the decryption key into on-chain and off-chain segments, effectively mitigating potential key exposure risks. BUR-CP-ABE offers a revocable and key secure CP-ABE scheme.