A can bus communication method based on pseudo-random numbers

Abstract

The invention provides a CAN bus communication method based on a pseudo-random number. The CAN bus communication method comprises the steps that a CAN message sending terminal is used for generating arandom seed; a first random function is utilized to generate a first random number according to the random seed; the random seed and the first random number are stored in a CAN message to update theCAN message, and the updated CAN message is sent to a CAN message receiving terminal; the CAN message receiving terminal is used for receiving the CAN message sent by the CAN message sending terminal;the CAN message is parsed to obtain the random seed and the first random number, and the first random number is generated according to the random seed by utilizing the first random function; whetherthe generated first random number is the same as the first random number obtained through parsing or not is judged, if yes, response is made to the CAN message. By storing the randomly generated random seed and the first random number in the CAN message, it can be ensured that CAN messages are different, accordingly the CAN messages do not have foreseeability, forgery attack can be prevented, andthe CAN bus communication method has the advantage of high safety.

Description

technical field [0001] The application belongs to the field of CAN bus communication, in particular to a CAN bus communication method based on pseudo-random numbers. Background technique [0002] In the prior art, the way to prevent CAN bus attacks is the CAN bus rolling code mechanism, and the CAN bus rolling code mechanism is mostly changed in an arithmetic or proportional way, that is, a sequence is generated in an arithmetic or proportional way, and when sending a message, press The sequence extracts the values ​​from the sequence and puts them in the message. [0003] There are following defects in the above-mentioned mode of preventing CAN bus attack: [0004] 1) It is predictable and derivable, and the security is not high. Attackers can easily implement forgery attacks by learning the changing rules of rolling codes. [0005] 2) Misjudgment will occur in the case of packet loss and delay. Contents of the invention [0006] This application provides a CAN bus com...

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Problems solved by technology

[0006] This application provides a CAN bus communication method based on pseudo-random, which is used to solve the problems that CAN bus communication in the prior art is easy to be attacked, the security is not high, and wrong judgment or misjudgment will occur in the case of packet loss and delay.

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