The Search and Improvement of DES Algorithm for Data Transmission Security in SCADA

Abstract

With the application of SCADA (Supervisory Control and Data Acquisition) is becoming more and more extensive in the national critical infrastructure. At the same time, compared with conventional control system, the data communication of SCADA system becomes more diverse and complex, and the communication system is more likely to be attacked, so improving the level of information security of SCADA system is very important and urgent. However, the wide application of DES has a short key in the world, which cannot meet the demand of the current network security. In this paper, ADES (Advanced Data Encryption Standard) algorithm is proposed and implemented in the C++ language, which is based on the deep research of data encryption methods and DES algorithm particularly. The method extends the length of DES from 64 bits to 128 bits. The function of ADES algorithm is closed to SM4 by experimental result, so the ADES can well meet the requirement of data transmission security.