KaiJern (xwings) is a senior security researcher in JD.COM. His research topic mainly on embedded device, hardware security, blockchain security, reverse engineering and various security topics. He presented his findings in different international security conferences like HITB, Codegate, QCon, KCon, Brucon, H2HC few different Defcon group and etc. He conducted hardware Hacking course in various places around the globe. He is also part of core team member/review board for Hack In The Box Security Conference and advisor for UnicornTeam/HACKNOWN Team.