Study Of Wireless Communication Security For Traffic Signal Controller

With the development of economy, the traffic congestion problems have been attracted more and more attention. Intelligent transportation system has become an important way of solving the traffic problems. The traffic signal controller is one of the most important parts of the intelligent traffic system. Traffic signal controller system supporting wireless communication is a trend. However, it leads to security risks. Considering the security risks, traffic signal controller framework is presented based on Loongson 1C processor, and the secure communication scheme is designed.The main work of this dissertation is as follows:1. Design of wireless secure communication scheme.After analyzing GPRS data transmission characteristics and communication security issues, encryption and authentication are proposed. According to the requirement of the traffic signal controller and the existing secure communication scheme, the shared key is used to make the wireless communication scheme simple and security instead of the third party server structure. The scheme adopts AES encryption and ECDS A algorithm. Aiming at the weakness of the AES key expansion algorithm, an improved AES key expansion algorithm is proposed.2. Design of traffic signal controller platform.First of all, compared with existing works, the flexible traffic signal controller frame is given based on Loongson 1C processor. This paper designs the core module and the vehicle detector module, then describes the working principle and gives the corresponding circuit diagram. Finally, the software design is given, including the driver support, the CAN communication protocol and the application layer logic.3. Implementation and analysis of secure communication scheme.Considering the characteristics of wireless communication system data transmission and system communication message, this paper gives the implementation process, including the work mode selection and encryption algorithm parameters. Finally, the communication scheme is analyzed including the signature process of security and data transmission. The data transmission is faced with block cipher attack analysis.