Analysis of the influence of CAN bus encryption and decryption on real time performance

Abstract

With the rapid development of intelligent network connected vehicle, information security has been paid more and more attention. In order to solve the problem that the vehicle bus information is transmitted directly without encryption, which is easy to be illegally monitored and maliciously cracked, it is planned to encrypt the vehicle bus information before transmission. Sender and receiver use the same encryption algorithm and key. The sender encrypts the data before sending the message, while the receiver decrypts the data after receiving it. In order to study the influence of CAN bus encryption and decryption on transmission efficiency, taking TC299 chip as an example, different encryption and decryption algorithms are used to encrypt and decrypt data with different lengths. The research shows that the time of symmetric encryption is much less than that of asymmetric encryption; With the increase of the length of the data to be encrypted and decrypted, the time required for encryption and decryption also increases; The time of encryption and decryption is microseconds, which will not affect the real-time performance of the bus.