Message transmission method and system

Abstract

The invention provides a message transmission method and system. The method comprises: when an abnormal event occurs at a sending end, the sending end extracting the latest first message rolling codeand increasing the offset; and sending the message data and the first message rolling code added with the offset to a receiving end until the first message rolling code received by the receiving end is greater than the latest second message rolling code extracted by the receiving end, and passing the rolling code verification. After an abnormal event occurs at a sending end, the sending end sendsa first message rolling code with increased offset to a receiving end. The first message rolling code is rapidly increased. By reasonably selecting the value of the offset, rapid synchronization of the message rolling code between the sending end and the receiving end can be realized, communication between the sending end and the receiving end can be rapidly recovered after the rolling code passesverification, the situation that verification fails or the message is misjudged as a replay attack is avoided, and the security in the message transmission process is improved.

Description

technical field [0001] The present invention relates to the technical field of information transmission, in particular to a message transmission method and system. Background technique [0002] In the vehicular communication system, the vehicular communication network is often faced with the threat of replay attacks. The so-called replay attack means that the attacker records the message sent by the sender to the receiver, and then at some point in the future, the attacker pretends to be the sender and sends a fake message to the receiver. In the case of false information, the identity of the sending end can be forged to send a message to the receiving end. If the false message contains a car control instruction, the action of illegally controlling the vehicle can be realized. [0003] For protection against replay attacks, both the sending end and the receiving end need to store message rolling codes locally. The message rolling code of the sending end is defined as the fi...

AI Technical Summary

Problems solved by technology

[0004] In practical applications, in order to ensure that the message rolling code will not be lost after power failure, the sending end and the receiving end usually store the message rolling code in a non-volatile memory (NVM, Non Violate Memory), but the life of the non-volatile memory Limited, so the message rolling code will be temporarily stored in the random access memory (RAM, Random Access Memory) of the chip first, and then stored in NVM in due course. However, the message rolling code temporarily stored in RAM may be lost due to abnormal conditions , such as power failure, data packet loss, node disconnection, program restart, node hibernation, etc., which will cause the message rolling code between the sending end and the receiving end to be out of sync, so that the message data cannot be accurately authenticated, resulting in verification failure or being blocked. Misjudged as a replay attack

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