Funding for this research was provided by:
the National Natural Science Foundation of China (Grant No.61362021, 11361018)
the National Natural Science Foundation of China (11601012)
Guangxi Key Laboratory of Cryptography and Information Security (GCIS201708)
GUET Excellent Graduate Thesis Program (16YJPYSS22)
Guangxi Natural Science Foundation (2018GXNSFAA138169)
Article History
Received: 8 November 2018
Accepted: 17 June 2019
First Online: 27 June 2019