System for realizing in-vehicle communication

Abstract

The invention discloses a system for realizing in-vehicle communication. Same original secret keys are stored in encryption chips of the sending end vehicle-mounted device and the receiving end vehicle-mounted device. Before the rolling number in the message is repeated every time, the transmitting-end vehicle-mounted equipment and the receiving-end vehicle-mounted equipment update the secret keyby using the original secret key and a random number generated by an encryption chip of the transmitting-end vehicle-mounted equipment, and if the secret key is successfully updated, the communicationprocess is encrypted by using a check code generated by a new secret key before the rolling number is repeated next time. According to the method and the device, the check codes in the messages are different under the condition of limited enumeration of the rolling number, so that the communication security between the vehicle-mounted equipment is enhanced.

Description

technical field [0001] The invention relates to the field of automobiles, in particular to a system for realizing in-vehicle communication. Background technique [0002] At present, in the process of in-vehicle communication between the on-board devices of the vehicle, in order to ensure the security of the communication data in the vehicle, a check code is generally added to the message transmitted between the on-board devices of the vehicle (that is, the message + Check code) to help verify whether the message comes from a legitimate source. For the generation of the verification code, it is supported to use the MAC (Message Authentication Codes, message authentication code) algorithm to calculate the MAC value of the message based on the key and the message digest HASH, and use the MAC value as the verification code. That is, check code=HASH algorithm (key, message). However, when this method is used for encryption, when the content of the message remains unchanged, the...

AI Technical Summary

Problems solved by technology

However, when this method is used for encryption, when the content of the message remains unchanged, the generated verification code is also unchanged, so for a "hacker", even if he does not know the encryption algorithm and key, he can intercept the information in the vehicle After the messages transmitted between the vehicle-mounted devices, the vehicle-mounted devices can still be controlled by sending the same message, thereby affecting the safety of the entire vehicle

[0003] In response to the above problems, in order to ensure the variability of the generated verification code, some manufacturers use the rolling number (Rolling Counter) that is repeatedly changed according to the predetermined rules on the message to increase the variability of the verification code, but due to the change of the rolling number There is repetition, and "hackers" can still attack on-board equipment without knowing the encryption algorithm and key through exhaustive methods, thereby affecting the safety of the entire vehicle

Images