US 12,278,805 B2
Method of controlling security key of vehicle
Soon Myung Kwon, Suwon-si (KR); Aram Cho, Seoul (KR); Seong Cheol Park, Seongnam-si (KR); and Taehwan Park, Seoul (KR)
Assigned to Hyundai Motor Company, Seoul (KR); and Kia Motors Corporation, Seoul (KR)
Filed by HYUNDAI MOTOR COMPANY, Seoul (KR); and KIA CORPORATION, Seoul (KR)
Filed on Dec. 9, 2022, as Appl. No. 18/078,459.
Claims priority of application No. 10-2022-0004202 (KR), filed on Jan. 11, 2022.
Prior Publication US 2023/0224284 A1, Jul. 13, 2023
Int. Cl. H04L 29/06 (2006.01); H04L 9/40 (2022.01)
CPC H04L 63/0435 (2013.01) 18 Claims
OG exemplary drawing
 
1. A control method of a vehicle by a first controller and a second controller, the control method comprising:
generating, by the first controller, an Ea(B) by encrypting a first message encryption key using a first symmetric key, and assigning a first random number to the Ea(B);
receiving, by the second controller, the Ea(B) and the first random number, generating a second message encryption key by decrypting the Ea(B) using a second symmetric key, and generating an Eb(N(MASTER)) by encrypting the first random number using the second message encryption key;
receiving, by the first controller, the Eb(N(MASTER)), and generating a second random number by decrypting the Eb(N(MASTER)) using the second symmetric key; and
updating, by the first controller, the first message encryption key when the first random number is the same of the second random number.