铁路信号系统中安全算法时效性分析

为有效评估和提升铁路信号系统传输协议的安全性,对铁路信号系统中的安全算法进行时效性分析。通过仿真实验对常用的4个的哈希函数和6个加密解密函数进行了定量评估。实验结果表明,安全算法的处理时间随应用数据长度的增长而增长;加密解密函数的工作模式对时效性影响不大;加密解密函数的解密算法消耗时间大于加密算法;SHA256哈希函数为保证数据完整性安全算法的首选方案;Twofish算法为加密解密算法的首选方案。该时效性分析结论为铁路信号系统安全算法的选择提供了参考依据。

Timeliness analysis of safety algorithm in railway signal system

In order to effectively evaluate and improve the security of the transmission protocol of the railway signal system, this article analyzed the timeliness of the safety algorithm in the railway signal system.Through the simulation experiment, the article evaluated four hash functions and six encryption and decryption functions quantitatively.The experimental results show that the processing time of the security algorithm increases with the length of the application data; the working mode of the encryption and decryption function has little effect on the timeliness; the decryption algorithm of the encryption and decryption function consumes more time than the encryption algorithm; the SHA256 hash function is the preferred scheme to ensure the data integrity security algorithm; the Twofish algorithm is the preferred scheme of the encryption and decryption algorithm.This conclusion provides a reference for the selection of safety algorithm of railway signal system.