Research on security for multidomain communication in space-air-ground integrated network

With the continuous development of communication technology, the integration of space-based, aerial-based, and ground-based networks has become an important trend in the development of future communication networks. However, this integration is characterized by high complexity and dynamic changes, facing security challenges that traditional ground mobile networks do not possess. This paper first introduces the architecture and characteristics of space-air-ground integrated networks, analyzes the security threats they face, including intra-domain risks and cross-domain risks. In response to these security challenges, this paper proposes a multi-domain network security architecture based on three fundamental security capabilities: trust, defense, and monitoring. This architecture achieves intelligent and autonomous security decision-making and control for multi-domain networks, as well as cross-domain collaborative security protection, thereby effectively ensuring the communication security of space-air-ground integrated networks.