1. College of Computer Science and Technology, Zhejiang University, Hangzhou, China
2. College of Computer Science and Big Data, and the Zhicheng College, Fuzhou University, Fuzhou, China
3. College of Information Engineering, and the College of Artificial Intelligence, Yangzhou University, Yangzhou, China
4. Center of Excellence in Information Assurance, King Saud University, Riyadh, Saudi Arabia