Method and system for identity authentication between master station and slave station in SCADA (Supervisory Control and Data Acquisition) system

Abstract

The invention provides a method and system for identity authentication between a master station and a slave station in an SCADA system. The method comprises following steps that: the master station A creates service and generates a symmetric polynomial coefficient aij; the slave station B builds connection with the master station A according to the IP address of the server of the master station A; after the connection is built successfully, the slave station B and the master station A share the symmetric multinomial parameter; both the master station and the slave station take the data frames of a communication protocol as own identity identifier IDA and IDB; the master station and the slave station exchange mutual identity identifiers; the identity identifiers are substituted into a symmetric polynomial for calculation; if f(IDA, IDB) is equal to f(IDB, IDA), the slave station B and the master station A realize two-way authentication; and a symmetric encryption key KAB is obtained through calculation and extension. According to the method and the system of the invention, the shared key is generated by the symmetric polynomial; the shared key is taken as the symmetric encryption key; a symmetric encryption algorithm is used in the message exchange process; and therefore, the calculation complexity is reduced.

Description

technical field [0001] The invention relates to an identity authentication technology used between master and slave stations of a SCADA system, in particular to a bidirectional authentication technology based on a symmetric polynomial encryption mechanism, and specifically relates to the guarantee of the communication security of the master and slave stations of the SCADA system. Background technique [0002] With the continuous development of information technology and the increasing level of industrial modernization, industrial control systems (Industry Control System, ICS) are widely used in many industries closely related to the national economy and people's livelihood, such as metallurgy, water and electricity supply, oil and gas transmission, aerospace, road traffic, etc. It plays an irreplaceable role in the construction of social production and security infrastructure. A typical SCADA (Supervisory Control and Data Acquisition) system is mainly used for remote monitor...

AI Technical Summary

Problems solved by technology

[0013] The above research shows that the SCADA system mainly uses symmetric encryption algorithm to realize the encryption transmission and decryption verification process of data, but the security of the session key needs to be enhanced, the identity authentication mechanism of both communication parties needs to be improved, and the existing security protection mechanism cannot effectively prevent users from and illegal access of equipment

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