Security Enhancement Mechanism of Modbus TCP Protocol

Xuan Luo, Yongzhong Li


Considering the security problem of the Modbus TCP protocol, this paper proposes a secure protocol, Modbus-E. It uses symmetric key and digital signature technology to ensure the confidentiality and authentication of data. It also uses the synchronization principle and the mono-direction principle of the hash function to ensure the uniqueness of data. Through the Filtering method of "white list", it can guarantee the controllability of instruction, ultimately without any increase in communication process to achieve secure communication. Through the verification and analysis of experiment, Modbus-E protocol can prevent the authentication attack, man-in-the-middle attack and replay attack of the instruction by the attacker. Compared with existing methods, this method is more secure and can comprehensively improve the security of Modbus TCP communication.


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