Information security transmission method for numerical control bus

Abstract

The invention discloses an information security transmission method for a numerical control bus, which comprises the following steps of: taking two sending parties as a master station and a slave station respectively; calculating a cyclic redundancy check (CRC) value in the master station, encapsulating the CRC value into an information security message and sending the information security message to the slave station; performing CRC on the received information security message by the slave station; if the CRC value is correct, recalculating the CRC value, encapsulating the recalculated CRC value into a new information security message and sending the new information security message to the master station by the slave station; performing CRC on the received new information security message t by the master station; if the CRC value is correct, judging whether communication is finished or not and if the communication is not finished, sending a next information security message to the slave station by the master station; and if the communication is finished, finishing the communication. A dynamic CRC method is adopted and an initial value is only produced by the master station, so asynchronous and synchronous communication requirements of the numerical control bus can be met at the same time and the remaining error rate is low.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a message security transmission method for a numerical control bus. Background technique [0002] In the communication process of the bus-based control system, communication errors usually occur and cause chain reactions. Initially, some basic errors such as hardware and software system errors and external interference may cause message errors in the communication process, mainly including message Duplication, deletion, insertion, incorrect sequence, destruction, delay and camouflage, etc., which may further lead to system errors, thereby affecting the normal communication of the control system. The basis of communication is message transmission, and wrong messages will bring harm to the control system. Therefore, communication security focuses on the secure transmission of messages. [0003] An effective way to solve this problem is to add a secure communication layer on...

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