SE-CAS: Secure and Efficient Cross-Domain Authentication Scheme Based on Blockchain for Space TT&C Networks

Recently, the space TT&C networks have attracted much attention, as they can provide users with efficient and convenient information services. However, multiple independent management domains are responsible for authorization and authentication in the network, resulting in users needing to transmit many authentication messages when crossing domains. Therefore, how to efficiently authenticate users from different domains and protect their privacy has become an important issue. We propose a secure and efficient cross-domain authentication scheme (SE-CAS), which introduces blockchain to build a distributed key management architecture to establish trust between different domains and record and share parameters on domain nodes. Specifically, we propose a blockchain-based cross-domain authentication method that utilizes signatures and pseudonyms related to user identity for authentication. For massive messages from different management domains, we combine lightweight BLS signatures with group signatures to achieve batch anonymous authentication for multi-users and tasks. Security analysis shows that our scheme can authenticate requests from different domains, achieve conditional privacy-preserving, and track malicious users. Performance analysis shows that SE-CAS has lower computational overhead in cross-domain authentication, especially in handling multiple computing tasks, with higher batch authentication efficiency.