| The career of urban rail transit has been rapidly developed in China.With the continuously improving of the train running density and carrying capacity,the moving block technology has already been completely adopted in signal systems of the new urban rail transit.And further,the unmanned signal system has become the development direction of the future urban rail transit signal system in the construction of national demonstration lines of the unmanned technology.On the security of signal systems,unmanned driving puts forward higher requirements that the car-ground wireless channel of signal systems provides a higher transmission bandwidth and a more stable transmission channel.The signal system is the key equipment to ensure the safe operation of the subway,the safety and reliability of which directly determine the efficiency and safety of the train traffic.Hence,building the safe and reliable control system of train operation is the problems urgently needing to pay attention to and solve at present.The signal system of rail traffic based on communication is completely built on the open data communication network,while the security risk facing the open data communication system is a threat to the application security of CBTC.So,the uniform standard secure communication protocol for open network must be researched and designed to ensure the reliability and safety of safety related data transmission,which is the necessary requirement of improving the control security and interoperability in the current rail traffic signal control systems.Based on the analysis of the possible existing threats of the data security transmission in the open transmission system proposed by the EN50159-2 standard specification,the main work of this project carries on the key research of Subset-098、Subset-037 secure communication protocol of ERTMS.On this basis,the safety communication protocol and secure communication software of the rail traffic CBTC system are designed and the implementation of the main functions of the security communication software is completed in the Linux operating system.The main work of this paper is the following aspects:(1)Based on the security threats related content of the open transmission system in EN50159-2 standard,evaluating and analyzing the data communication security of rail transit CBTC systems,analyzing the potential security threats and putting forward the corresponding prevention measures including using the serial number protection,TTS protection,non encryption security code and encryption protection.(2)Analyzing the structure of safety related transmission systems of Euroradio related protocol,focusing on the research that how safety related equipment communication entities establish a secure connection by the service primitives provided by the security function module,completing communication entity time offset estimation,message integrity and security communication entity peer entity authentication.(3)Deeply analyzing the security communication protocol hierarchy and workflow,detailed analyzing and deeply researching the key technologies of TTS,CBC-DES and others,completing the design of the key software modules of TTS,3-DES and ALE and software implementationThe running test results of the designed and implemented security communication protocol software under the simulated CBTC security device show that the secure communication protocol software designed in this project can meet the needs of end-to-end transmission delay,transmission rate,stability of the transmission channel in the CBTC system.The software achieves a very good security communication protocol functions,detects and prevents of the known 7 kinds of threats. |
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