Design of DCS system network communication based on hybrid encryption algorithm

Aiming at the network communication security and efficiency in DCS system, a network communication design system based on hybrid encryption was studied. A hybrid encryption algorithm was designed, which combined SM2 with AES encryption algorithm, completed symmetric encryption and encrypted data transmission in a short time, and a high-security asymmetric encryption algorithm was used to protect the key of the symmetric encryption algorithm. The system was implemented and performance was tested. The experimental results showed that the OPC UA gateway solution designed in this paper transmitted 3000 analog quantities with an average communication time of 186.89ms, and completed the transmission of 16.06 analog quantities per unit time. Through comparative analysis, it can be seen that the improved gateway solution has improved the communication efficiency by about 13.7%. The algorithm completes the encryption and decryption tasks in the data transmission process in the DCS system, and fully meets the gateway's requirements for time efficiency. It can be considered to be embedded in the OPC UA protocol to improve the overall performance of communication.