CAN bus encryption and authentication method

• Main Authors: XIAO SHIMAO, XING LISHA
• Format: Patent
• Language: Chinese; English
• Published: 05.01.2024
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

The invention relates to the field of vehicle-mounted communication CAN buses, in particular to an encryption and authentication method of a CAN bus. Firstly, a sending node carries out functional security level identification according to an identification code of a to-be-sent data frame, and two levels are subjected to different encryption and verification methods. For the first security level, a counter mode of AES encryption is used, high-order expansion of a plaintext is combined with a part of a counter numerical value, then XOR operation is carried out with encrypted data, an obtained result comprises a ciphertext and a message verification code, a sending node sends the ciphertext and the verification code by using an expansion frame, and for the second security level, encryption is realized by using an XTEA algorithm, and the encryption efficiency is improved. And using the checksum as a verification code, and using the extension frame to send the ciphertext and the verification code by the sending n