Research and Application of Security Compliance Analysis Technology of Transmission Protocol Based on Finite-state machine Theory

Due to the high real-time requirements for equipment communication in the power system and the physical isolation of the network, the design of power protocols lacks confidentiality protection. With the wide application of mobile Internet and smart grid, the power system network in the physical isolation state is slowly connected to the external network, although the connection has undergone some security protection. However, due to the inability to ensure complete isolation of the power system network from the internet or attackers during operation or partial physical protection, power transmission protocols without organic confidentiality protection are easily exploited by saboteurs, leading to unpredictable risks and even major power outages. In this paper, based on the Finite-state machine theory, the compliance analysis process of GOOSE, SMV, MMS and other security transmission protocols is modeled, and the corresponding compliance analysis rule set is generated. By analyzing the content of the secure transmission protocol data packet generated during the interaction process of the intelligent unit and matching it with the rules in the rule set, the compliance of the implementation of the secure transmission protocol is judged. This technology mainly detects the compliance of secure transmission protocols from aspects such as integrity, non repudiation, and identity authentication. While ensuring the security and effectiveness of transmission protocols, it improves the compatibility of transmission protocols and improves the efficiency of intelligent unit interaction.