LIU Shishi1,2, ZHANG Fengrong1,2, XIA Shixiong1, ZHOU Yong1
1.Mine Digitization Engineering Research Center of the Ministry of Education, School of Computer Science and Technology, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China
2.Guangxi Key Laboratory of Cryptography and Information Security, Guilin University of Electronic Technology, Guilin, Guangxi 541004, China