1. School of Computer Science and Engineering and the Shaanxi Key Laboratory for Network Computing and Security Technology, Xi’an University of Technology, Xi’an, China
2. Department of Electronic Engineering, Tsinghua University, Beijing, China
3. Department of Informatics, University of Oslo, Oslo, Norway
4. Bank of China Software Center, Xi’an, China
5. Xidian Guangzhou Institute of Technology, Xidian University, Guangzhou, China
6. Department of Applied Informatics, Silesian University of Technology Akademicka, Gliwice, Poland