Identity authentication method for vehicle diagnosis, diagnosis equipment and vehicle control unit

The invention relates to an identity authentication method for vehicle diagnosis, diagnosis equipment and a vehicle control unit. The method comprises the steps that the diagnosis equipment sends an identity authentication request carrying an equipment challenge code and an equipment certificate to a vehicle; after the vehicle passes verification according to the identity authentication request, a positive response carrying a vehicle certificate, a vehicle challenge code and a vehicle digital signature is sent to the diagnosis equipment; when the diagnosis equipment receives a positive response, verifying whether the vehicle certificate and the vehicle digital signature are valid, and if so, sending a diagnosis request carrying the equipment digital signature to the vehicle based on the UDS protocol; the vehicle verifies the validity of the equipment digital signature according to the equipment certificate, if the equipment digital signature is valid, the vehicle sends a diagnosis response to the diagnosis eq