Lattices-Inspired CP-ABE from LWE Scheme for Data Access and Sharing Based on Blockchain

To address the quantum attacks on number theory-based ciphertext policy attribute-based encryption (CP-ABE), and to avoid private key leakage problems by relying a trustworthy central authority, we propose lattice-inspired CP-ABE scheme for data access sharing based blockchain in this paper. Firstly, CP-ABE-based algorithm using learning with errors (LWE) assumption is constructed, which selective security under linear independence restriction random oracle model. Secondly, nodes can act as distributed management server offer control over master keys used generate different users that reflect their attributes through launching transactions system. Finally, develop smart contracts proving correctness of proxy re-encryption (PRE) provide auditability whole data-sharing process. Compared traditional algorithm, post-quantum significantly improve computation speed according result functional experimental analysis. Moreover, proposed blockchain-based provides not only multi-cryptography collaboration enhance but also reduces average transaction response time throughput.