Research On Railway Singnal Security Protocol-Ⅱ And The Implementation Of Core Algorithm

Safety is the foundation of railway operation and development.In order to improve the operation capability of railway,CTCS-3 train operation control system is adopted in China.The CTCS-3 train control system adopts GSM-R wireless communication mode,which can shorten the time of vehicle communication,and has more information capacity and less capital input of ground equipments.However,the openness of wireless network brings great hidden trouble to railway safety.Therefore,China has developed the railway safety communication protocol RSSP-Ⅱ and RSSP-Ⅱ.In this thesis,considering the way of using the software design to realize RSSP-Ⅱ occupied too much CPU system resources,and considering that there is not a lot of complicated mathematical calculation of RSSP-Ⅱ,and the process of encryption/decryption is just logic operations,and the characteristics of the look-up table operation,we use the FPGA devices to design the core of the RSSP-Ⅱ algorithm.The design frees up the CPU system resources,improves the system operation efficiency,and has the high engineering application value.First of all,in this thesis,the RSSP-Ⅱ agreement structure are studied.And the security threats that the open system may be facing are introduced.The protocol is introduced in two architectural modules and three levels,and the process of secure communication is described in detail.Secondly,this thesis analyzes the computational complexity of implementing rssp-ii secure communication protocol based on complexity theory.It is found that the computational complexity of RSSP-Ⅱ protocol mainly comes from the encryption authentication algorithm.Then,the principle,encryption process are analyzed in detail,including IP replacement and inverse permutation,subkey generation,encryption function operation,etc.Finally,this thesis designed the MAC message authentication code generation process using FPGA decvice.And the hardware circuit is aslse designed in oder to verify the design.Through the research of this article,the encryption authentication algorithm of RSSP-Ⅱ security protocol is successfully realized.The thesis realized the complex communication control,improved the system performance,and guaranteed the reliability and security of the system by using the combination of CPU+FPGA on the security control system platform.