Fannv He (National Computer Network Intrusion Protection Center, University of Chinese Academy of Sciences, China, and School of Cyberspace Security, Hainan University, China), Yuan Liu (School of Cyber Engineering, Xidian University, China), Jice Wang (School of Cyberspace Security, Hainan University, China), Baiquan Wang (School of Cyberspace Security, Hainan University, China), Zezhong Ren (National Computer Network Intrusion Protection Center, University of Chinese Academy of Sciences, China), Yuqing Zhang (National Computer Network Intrusion Protection Center, University of Chinese Academy of Sciences, China; School of Cyberspace Security, Hainan University, China, and School of Cyber Engineering, Xidian University, China)