[1] Qingdao Univ Sci & Technol, Sch Math & Phys, Qingdao 266061, Peoples R China
[2] Southeast Univ, Frontiers Sci Ctr Mobile Informat Commun & Secur, Sch Math, Nanjing 210096, Peoples R China
[3] Purple Mt Labs, Nanjing 211111, Peoples R China
[4] Yonsei Univ, Yonsei Frontier Lab, Seoul 03722, South Korea
[5] Polish Acad Sci, Syst Res Inst, PL-01447 Warsaw, Poland
[6] AGH Univ Sci & Technol, Inst Comp Sci, PL-30059 Krakow, Poland