Cross-Domain Authentication and Key Agreement Protocol Based on Blockchain Technology

With the rapid development of big data, interactions in the network environment are increasing and the environment is becoming more complex. Cross-domain authentication plays a key role in secure data sharing. However, the cross-domain authentication scheme under the traditional centralized structure has problems such as over-reliance on trusted third parties, privacy leakage and low certificate efficiency. As an emerging technology, the decentralized feature of blockchain can avoid the drawbacks of traditional centralized trust mechanisms and effectively solve the cross-domain authentication problem. In this paper, we propose a cross-domain authentication and key agreement protocol based on blockchain technology. The root CA based on blockchain is used to establish a trusted consortium blockchain to ensure the authenticity and legitimacy of the root certificate. Then the identity authentication is realized through on-chain information and off-chain signature verification and uses biometrics identification to ensure the correctness of node identity. The protocol achieves identity authentication based on biometrics and signature and key agreement while ensuring security.