Method of communicating vehicle data for vehicle control

A method of communicating vehicle data for vehicle control, which is performed by an external device, the method comprising:

• (a) generating a multicast key and transmitting the multicast key to the vehicle in a multicast manner;
• (b) obtaining a hash key and an encryption key based on the multicast key and unique identification information of the vehicle;
• and
• (c) obtaining vehicle data by performing signal processing on first partition data to n-th partition data consisting of the vehicle data transmitted from the vehicle and combining the first partition data to the n-th partition data, wherein “n” is an integer equal to or greater than 2,
• wherein i-th partition data among the first partition data to the n-th partition data of the vehicle data includes i-th serial number information, an i-th message authentication code (MAC) chaining value, i-th payload information, and an i-th MAC tag, wherein “i” is an integer from 1 to n, and
• wherein (c) comprises:
• (c-1) receiving the i-th partition data,
• (c-2) authenticating the i-th partition data by comparing the i-th MAC tag with an authentication value generated by computing at least the i-th MAC chaining value and the i-th payload information by using the hash key and a predetermined MAC generation algorithm, and
• (c-3) decrypting the i-th payload information using the encryption key when the i-th partition data is authenticated.