Research on Zero Trust Access Control Model and Formalization Based on Rail Transit Data Platform

Aiming at the network security threat in rail transit data platform, this paper proposes a fine-grained dynamic access control model based on zero trust and describes it formally. According to the idea of zero trust, combined with the methods of role-based access control, attribute-based access control and trust-based access control, the access request is judged and authorized in real time and dynamically, and evaluated continuously. Based on this model, the corresponding security platform can be developed to realize fine-grained dynamic access control and protect the data resources and physical assets in the rail transit industrial control system.