Research And Implementation Of 5G-PROFIBUS-DP Network Access Method For Industrial Internet

With the rapid development of industrial Internet and popularization of 5G networks,the application of 5G technology in industrial field has become more and more extensive and more diversified.The integration and application of 5G technology and fieldbus technology has become a focused area.PROFIBUS is one of the common international fieldbus standards at present,and has become the most important and widely used fieldbus because of its unique technical characteristics,strict certification specifications,open standards,support from many manufacturers and evolving application rules.Connecting it with 5G network can realize remote real-time control of field devices and bring great convenience for engineers to monitor and manage field devices remotely.In order to realize the interconnection of PROFIBUS-DP fieldbus and 5G network,this study proposes to use the gateway method to realize the interconnection of these two heterogeneous networks based on the in-depth study and analysis of their network structure and protocol structure,and designs the 5G-PROFIBUS-DP protocol conversion flow,the 5G PROFIBUS-DP gateway,and the FPGA-based PROFIBUS-DP message parsing and encapsulation module in the gateway.Considering the data security problem caused by connecting the PROFIBUS-DP fieldbus to the open 5G network and breaking the original closed and secure environment of the industrial field,the SM4 algorithm,which has superior security and operation speed in symmetric cipher,is proposed to encrypt the data plaintext during the communication between PROFIBUS-DP bus and 5G network.To address the problem that the fixed public CK parameters and S-boxes in the SM4 algorithm lead to the hidden danger of cipher decipherment,an improved SM4 algorithm based on dynamic ideas is proposed to improve the difficulty of deciphering the algorithm.The improved SM4 algorithm uses pseudo-random numbers generated by LFSR to replace the originally fixed and public CK parameters,and replaces the fixed single S-box with two S-boxes randomly selected by LFSR.Based on this,the corresponding improved SM4 algorithm module based on FPGA is designed.A hybrid encryption and decryption method based on the improved SM4 algorithm is proposed for the problem that the random seeds and keys of the improved SM4 algorithm have security risks in the transmission process and the improved SM4 algorithm cannot check data integrity.The method uses the SM2 algorithm to encrypt and decrypt the random seeds and keys of the improved SM4 algorithm to ensure their security during transmission,and uses the SHA256 algorithm to calculate the digest of the plaintext of data to ensure the integrity of data during the communication between PROFIBUS-DP fieldbus and 5G network.Based on this,the design of FPGA-based hybrid encryption and decryption module is completed.Based on the PROFIBUS-DP message parsing and encapsulation module and the hybrid encryption and decryption module,the FPGA-based 5G-PROFIBUS-DP gateway design is completed,mainly including the data transmission module and the data reception module of the gateway.And the simulation and analysis of the 5G-PROFIBUS-DP gateway are carried out based on the joint platform of Quartus II and Model Sim,including the individual simulation of each sub-module and the simulation of the data transmission module and data reception module of the gateway.The simulation results show that each sub-module of the gateway is correctly designed,and the 5G-PROFIBUS-DP gateway can realize the parsing and encapsulation of PROFIBUS-DP messages,which can effectively guarantee the confidentiality and integrity of data during the communication between PROFIBUS-DP bus and 5G network.Finally,the rationality and feasibility of the gateway designed in this research are analyzed from the two aspects of time resource cost and hardware resource cost.