*2.4. Feasibility*

Based on the way the CAN messages are defined in the DBC file and the characteristics of the multiple linear regression model, this section presents the feasibility of a bit-level inverse CAN message.

According to the definition of the DBC file, the vehicle behavior in the CAN message is expressed as a binary serial number of bits, and there is also a resolution and an offset between the actual vehicle behavior data and this value. As shown in Figure 3, the relationship between the actual vehicle behavior and the corresponding bits in the CAN message is linear, and the adjacent linear coefficients satisfy the two-fold relationship. A multiple linear regression model of sensor data and each bit in the CAN message can be constructed when sensors are used to obtain vehicle behavior data. If the adjacent regression coefficients *β* satisfy the doubling relationship, the consecutive bits corresponding to the coefficients describe the vehicle behavior. In addition, the length, boundary, and alignment of the data can be determined based on the *β* that satisfies the condition.

**Figure 3.** Reverse feasibility based on linear regression.
