A cross-domain authentication scheme based on quantized trust relationship for smart grid

The power grid has transitioned into a network system, comprising increasingly large-scale, complex multi-intelligent devices, multi-sensors, and multi-control units. Concurrently, the rapid advancement of quantum computers presents significant challenges to cross-domain authentication based on traditional cryptographic systems due to decryption issues. To address the issue of sharing identity authentication information across different trust domains, this paper introduces a lattice-based cross-domain encryption transmission scheme. This scheme resists quantum attacks and facilitates cross-domain identity authentication by pre-storing public parameters in the verifier entity and constructing a quantified trust relationship model between nodes within the cross-domain mechanism. This approach further enhances the security of keys and the authentication efficiency between nodes.