CAN bus communication information security enhancement method based on CRC verification

The invention provides a CAN bus communication information security enhancement method based on CRC verification. According to the method, a special additional parameter table and a frame counter aredesigned for each key data frame. At a sending end, a low-byte part Cnt_L of a first frame counter is intercepted and placed in a data field, then a first parameter X is selected from a first additional parameter table, the first parameter X, the Cnt_L and a protocol data unit PDU are combined into a data string, and a CRC check code of the data string is calculated and placed in the data field. At a receiving end, frame counter information in the data field is extracted, the frame counter information is synthesized with a high byte part Cnt_h of a second frame counter to obtain a complete frame counter value, and the value is checked to prevent a replay attack; and a second CRC code is generated after the check is passed, and the second CRC code is compared with the first CRC code to check the integrity and sourc