Information timeliness safety judgment method in safety coding communication system

Abstract

The invention relates to an information timeliness safety judgment method in a safety coding communication system. The method comprises the steps that (1) the system initializes a timestamp T(0) and code data M(0) corresponding to the timestamp; (2) the system updates the timestamp and the code data corresponding to the timestamp every cycle; (3) a network communication node END1 transmits a timestamp T(i) and code data M(i) corresponding to the timestamp to a network communication node END2; (4) END2 packs and replays the timestamp and the code data corresponding to the timestamp to the END1, wherein the timestamp and the code data corresponding to the timestamp are transmitted by the END1; (5) after the END1 receives the package, an information timeliness check word is generated and is transmitted to a third party to be judged according to the timestamp and the code data corresponding to the timestamp in the package, and a current timestamp T(n) and code data M(n) corresponding to the current timestamp T(n). Compared with the prior art, the information timeliness safety judgment method in the safety coding communication system has the advantages of being low in complexity, low in time consumption, safe, reliable and the like.

Description

technical field [0001] The invention relates to the field of information security in a communication system, in particular to a method for judging the timeliness security of a message in a secure coding communication system. Background technique [0002] In the communication system, it is often necessary to make a security judgment on the timeliness of the communication message. Most communication systems add local and remote time stamps to the message body to judge the timeliness of the message. This method can meet the requirements in the non-secure system, but in the subway vehicle In the safety system such as the subsystem of safety input and output control of the system and the interlock system, the safety requirements can no longer be met. In the safety input and output control subsystem and interlocking system of the subway on-board system, the safety data are boolean quantities. In order to ensure safety, the system encodes the boolean quantity into 32-bit redundant ...

AI Technical Summary

Problems solved by technology

[0002] In the communication system, it is often necessary to make a security judgment on the timeliness of the communication message. Most communication systems add local and remote time stamps to the message body to judge the timeliness of the message. This method can meet the requirements in non-safety systems, but in the subway vehicle In safety systems such as safety input and output control subsystems and interlock systems, the safety requirements can no longer be met.

In the safety input and output control subsystem and interlocking system of the subway on-board system, the safety data are Boolean quantities. In order to ensure safety, the system encodes the Boolean quantity into 32-bit redundant data that conforms to a certain algorithm. The characteristic of the system is that only Boolean variables can be safely encoded and integer quantities cannot be encoded

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