一种在城市轨道交通信号系统中应用的加密故障恢复方法

A Restoring Method Applied in Urban Rail Transit Signaling System Targeting Encryption Failure

针对应用了国产密码算法的城市轨道交通信号系统,提供了一种在国产加密安全芯片发生故障时的信号系统通信恢复方法。详细阐述了发生加密故障时的信号系统通信恢复流程,并通过试验及计算,验证了采用该方法的信号系统性能。该方法能在不影响信号系统既有架构和功能安全等级的前提下,通过系统旁路将密文通信恢复为明文通信并及时报警,提高了信号系统的可用性和可维护性。

Targeting the urban rail transit signaling system that adopts domestic cryptographic technology,a restoring method of signaling system communication when domestic encryption security chip fails is proposed.The signaling system communication restoring process during encryption failure is expounded,and the signal system performance that adopts this method is verified through test and calculation.Without affecting the existing architecture and function safety level of the signal system,this method is capable of restoring encrypted communication to decrypted communication with bypass function and it will alarm in time,which increases applicability and maintainability of the signaling system.