开放通信系统安全码的生成和应用

安全码被认为是安全相关通信中的最关键技术,而在开放通信系统中,安全码技术除了需要保证安全信息的完整性之外,也要负责接入保护、检测非授权接入设备产生的伪装消息。首先以EN50159-2为依据,分析基于开放通信系统的安全信息传输需求,阐述利用安全码、时间戳、序列号等技术满足这些需求的过程与机理。然后,描述开放通信系统安全码在保密性能和检错能力方面的需求,在给定的系统SIL等级要求下,给出开放通信系统安全码的选择原则与生成过程。最后,以CTCS-3级列控系统车-地无线安全通信的安全码技术为例说明,通过应用3DES消息认证码作为开放通信系统的安全码,实现了对安全相关消息损坏的防御,以及对安全相关消息的认证。

Security Code Generation and Application of Open Communication System

Safety code is regarded as the most critical technique in safety related communication. Furthermore,safety code takes charge of not only the integrity of safety message but also the protection against masqueraded message from unauthorized access device in open communication systems. Firstly,according to EN50159-2,the requirements of safety massage transmission is analyzed and how the techniques e.g.safety code,time stamp and sequence number satisfy these requirements is stated. Secondly,the security and error checking ability requirement of safety code is described,the choosing discipline and generating process of safety code in open communication system is given. Finally,the example of CTCS-3 onboard-trackside mobile communication safety code is proposed. The 3DES message authentication code （MAC） is used as safety code of open communication system that realizes both the defense against message corruption and the authentication to safety related messages.