基于时间触发机制的通信总线安全性分析  

Security Analysis of Communication Bus Based on Time Trigger Mechanism

作　　者：林捷 LIN Jie(College of Photonie and Electronic Engineering, Fujian Normal University,Fuzhou 350100)

机构地区：[1]福建师范大学光电与信息工程学院,福州350100

出　　处：《现代计算机（中旬刊）》2018年第4期12-17,共6页Modern Computer

摘　　要：时间触发机制是在预先规定的时间激励系统的活动,使得系统中各对象的行为是确定的、可预测的。因此基于时间触发原理设计的通信总线能有效地满足计算机控制系统确定性要求,非常适用于安全苛求领域。基于FMEA方法对时间触发通信进行可靠性评估,从物理层与链路协议层两方面分析时间触发通信总线可靠性,并结合轨道交通领域EN50159安全通信标准,分析几种安全策略下时间触发通信总线的安全性。通过分析表明物理层上采用冗余设计能有效地提高总线通信的容错能力,以及链路层采用检错差错控制策略能提高通信系统的整体可靠性。最后采用定量和定性相结合的方法验证,并综合时间触发总线的传输时延特性,进一步说明时间触发总线能提高安全关键系统中整体可靠性和安全性。The time triggering mechanism is to motivate the activities of the system at a predetermined time, so that the behavior of each object in the system is deterministic and predictable. Therefore, based on the principle of time trigger design of the communication bus can effectively meet the computer control system deterministic requirements, is very suitable for security and demanding areas. Based on the FMEA method, evaluates the reliability of time-triggered communication, and analyzes the reliability of the time-triggered communication bus from the physical layer and the link protocol layer. Combined with the EN50159 security communication standard in the rail transit field, analyzes the security of time-triggered communication Bus. The results show that the redundant design of the physical layer can effectively improve the bus communication fault tolerance. The link layer uses error detection and control strategy to improve the overall reliability of the communication system. Finally, the method of quantification and qualitative combination is used to verify and the time delay of the bus is triggered by the integrated time. It is further explained that the time-triggered bus can improve the overall reliability and security of the security critical system.

关 键 词：风险评估 总线冗余 时间触发机制 消息重传 协议安全性 

分 类 号：TP336[自动化与计算机技术—计算机系统结构]