School of Mathematics and Computing Science;
GuangxiKey Laboratory of Cryptography and Information Security;
Guilin University of Electronic Technology;
Guilin 541004;
Guangxi;
China;
Guangxi Experiment Center of Information Science;
Guilin University of Electronic Technology;
Guilin 541004;
Guangxi;
China;
Shenzhen Digital TV National Engineering Laboratory Co.Ltd.;
Shenzhen 518057;
Guangdong;
China;