[Zhang, Cong; Zhang, Fan] Wuhan Polytech Univ, Sch Math & Comp Sci, Wuhan, Peoples R China.
[Zhang, Fan] Hangzhou Dianzi Univ, Coll Commun Engn, Hangzhou, Zhejiang, Peoples R China.
[Xu, Mingdi] Wuhan Digital Engn Inst, Syst Software Dept, Wuhan, Peoples R China.
[Yang, Minghui] Minist Publ Secur, Key Lab Informat Network Secur, Shanghai, Peoples R China.
[Yang, Minghui] Minist Publ Secur, Res Inst 3, Shanghai, Peoples R China.