針對分布式測控系統數據加密傳輸的應用要求，通過對DES 算法和Modbus 協議原理分析，給出了整個設計的原理框圖，使用Verilog HDL 實現了DES 算法和通信協議的IP 核設計，最后對測控數據進行加密傳輸測試，結果顯示該方法能較好的滿足數據實時加密通信的指標要求，整個設計具有較好的現實意義和應用價值。
【關鍵詞】Verilog 語言；DES 加密；Modbus 協議

A IP Core Interface Design of the data encryption system and Modbus Protocol
JIANG Cun-bo,SUN Chao-hua,TANG Bo,FU Han,DU Ting-ting (Electrical Engineering Department of GUT Guilin 541004 China) 【Abstract】In this paper,the author gives the iterative algorithm of the DES and Modbus Protocol in the hardware description language, with the requirements of the Distributed control system for transmission of data encryption, and completes the IP core design of the DES algorithm and the Modbus protocol with the help of the Verilog HDL Language and the FPGA chip EP2C5T144C6. at last,the test results to the network control module under the control of C8051F020 processor and the IP core chip show that this method can better meet the need of the real-time data encryption communication.
【Keywords】Verilog Language ；DES Encrypting；Modbus Protocol