An Authentication Scheme Using Identity-based Encryption & Blockchain

Identity-based encryption is a key distribution system in which the public key of a user is derived directly from his identity information. Compared with PKI, Identity-based encryption simplifies key management issue, but it still suffers from drawbacks in key escrow and private key delivering. Motivated by this, we propose an improved key distribution solution called BIBE by integrating the technique of blockchain into the identity-based encryption. Specifically, we split the nodes in the chain to complete user authentication and private key protection, respectively. Furthermore, the two sides complete the mutual identity authentication with the identity information key pairs obtained from BIBE. Additionally, to prevent network attack, we employ timestamps, random numbers and hash algorithm in the process of identification. Through the rigorous and mathematical analysis, the proposed scheme demonstrates a far better performance on correctness, safety and efficiency.