SungJin Yu received a B.S. degree in electronics engineering from Daegu University, as well as an M.S. degree in electronics engineering from Kyungpook National University, Daegu, South Korea, in 2017 and 2019, respectively, where he is currently pursuing a Ph.D. degree in electronics and electrical engineering. He is currently a Researcher with the Electronics and Telecommunications Research Institute (ETRI), Daejeon, South Korea. His research interests include blockchain, authentication, information security, VANETs, FANETs, the Internet of Vehicles, and the Internet of Drones.