针对区域计算机联锁系统站间通信的安全需求,采取增加安全相关传输功能的措施,设计了一种适用于区域计算机联锁系统的安全通信协议,该协议采用了序列号、时间戳、超时机制、源和目标标识、安全码等防御措施,以抵御不同的威胁,通过设置安全标志位实现故障导向安全功能。利用 OPNET工具对协议的实时性进行仿真,分析了报文长度与总线位速率对最大时延的影响。最后对协议进行安全性分析并计算出每小时的危险失效率为1.5×10-10,符合欧洲安全标准 SIL4的要求。%In view of the security requirements of inter-station communication of the regional computer interloc-king system,the measures for increasing the safety-related transmission functions were taken and the security communication protocol suitable for the regional computer interlocking system was designed.The protocol a-dapted the serial number,time stamp,time-out mechanism,source,target identification and security code etc as defensive measures to resist different threats and set the security flag to achieve fault-oriented security pro-tection.The real-time performance of the protocol was simulated with Tool OPNET and the impact of the packet length and bus bit rate on the maximum delay was analyzed.Finally,security of the protocol was ana-lyzed and the risk of the failure rate per hour was calculate as 1.5 × 10-10 which met the requirement specified in the European safety standard SIL4.
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