1. Zhejiang Shuren University, Hangzhou, Zhejiang, China
2. National Computer Network Emergency Response Technical Team, Coordination Center of China (CNCERT/CC), Beijing, China
3. China Telecom Jiangxi Branch Provincial Network Operation and Maintenance Department, Nanchang, Jiangxi, China
4. PLA Army Engineering University, Nanjing, Jiangsu, China