关键词: Modbus工控网络, 安全通信, 认证算法, 哈希链, 对称加密, 安全性分析

Abstract: With the development of modern industrial networks, more and more security problems appear. The Modbus protocol application is widely used in the industrial control network. However, the Modbus protocol is not secure, thus, it is vulnerable to malicious attacks. As far as is known there is no effective solution till now. In order to solve these security problems, this paper presents a dual authentication model, algorithm and configuration scheme for master and slave devices of Modbus based industrial network. The algorithm utilizes some features of Hash chain and symmetric encryption, and it is a lightweight authentication algorithm designed for the limited computing and storage capacity of Modbus based remote control system. The security analysis shows that the authentication algorithm can effectively resist the security problems of the common Modbus based industrial control network, and the algorithm configuration scheme can effectively reduce the interference of the authentication algorithm to the master and slave devices.

Key words: Modbus industrial control network, secure communication, authentication algorithm, Hash chain, symmetric encryption, security analysis