Vehicle diagnostic system, method, and apparatus

A vehicle diagnostic apparatus, comprising:

• at least one memory configured to store program instructions;
• and
• one or more processors coupled to the at least one memory and configured to execute the program instructions to cause the vehicle diagnostic apparatus to:
• receive, from a diagnostic device, a key authorization request comprising at least one piece of characteristic information, the at least one piece of characteristic information comprises an authorization code that indicates the diagnostic device;
• generate a temporary key based on the key authorization request, wherein the temporary key is independent of a long-term key in a vehicle;
• encrypt the at least one piece of characteristic information using a first symmetric key to generate a transmission security key;
• encrypt the temporary key using the transmission security key to generate a ciphertext;
• generate a key authorization response based on the ciphertext, wherein the key authorization response comprises the temporary key;
• send the key authorization response to the diagnostic device, wherein the diagnostic device is configured to perform decryption using the transmission security key and the ciphertext to obtain the temporary key;
• and
• configure the temporary key for a to-be-diagnosed device in the vehicle,
• wherein the diagnostic device and the to-be-diagnosed device perform a diagnostic based on the temporary key.

A vehicle diagnostic apparatus, comprising:

• at least one memory configured to store program instructions;
• and
• one or more processors coupled to the at least one memory and configured to execute the program instructions to cause the vehicle diagnostic apparatus to:
• send a key authorization request to a key management system in a vehicle to generate a temporary key and configure the temporary key for a to-be-diagnosed device in the vehicle, wherein the temporary key is independent of a long-term key in the vehicle;
• receive a key authorization response from the key management system, wherein the key authorization response comprises the temporary key;
• encrypt to-be-diagnosed information using the temporary key to generate a diagnostic request;
• send the diagnostic request to the to-be-diagnosed device;
• and
• initiate a diagnostic operation on the to-be-diagnosed device based on the diagnostic request.