Zuo-Wen Tan1,2 and Zhuo-Jun Liu3
1College of Information Management
Jiangxi University of Finance and Economics
Nanchang, Jiangxi Province 330013, P.R. China
2State Key Laboratory of Information Security
Institute of Software of CAS
Beijing 100190, P.R. China
3KLMM, AMSS of Chinese Academy of Sciences
Beijing 100190, P.R. China