A Secure Certificateless Identity Authentication Scheme Based on Blockchain

Centralized systems based on the trusted third-party are widely used in identity authentication. However, there is a single point of failure inherent in the centralized systems. As a natural decentralized architecture, blockchain can bring the advantages of decentralization, trustworthiness and immutability to the identity authentication systems. The existing blockchain-based identity authentication systems can solve the problem of single point of failure, but there are still problems such as certificate management. In this paper, we propose an identity authentication scheme based on blockchain and certificateless public key cryptography. The scheme implements a decentralized database by deploying smart contracts in the Ethereum blockchain, and uses the certificateless public key signature algorithm during the authentication process. Compared with other blockchain-based identity authentication systems, our scheme not only prevents the single point of failure, but also avoids the deficiency of certificate management, and resists impersonation attacks and man-in-the-middle attacks. The security analysis and performance analysis show the security and stability of our scheme.