1. Institute of Information Engineering, CAS,State Key Laboratory of Information Security,Beijing,China
2. University of Science and Technology of China,School of Cyber Security,Hefei,China
3. Headquarter of Chinese Academy of Sciences,Beijing,China
4. University of Science and Technology of China,Beijing Institute,Beijing,China
5. Beijing Certificate Authority Co., Ltd.,Beijing,China
6. University of Kansas,Department of Electrical Engineering and Computer Science,KS,USA