Funding for this research was provided by:
Natural Science Foundation of Shandong Province (ZR2014FQ005)
The Fundamental Research Funds for the Central Universities (15CX02065A, 15CX08011A, 15CX02056A, 16CX02013A, 16CX02009A)
Fujian Provincial Key Laboratory of Nenwork Security and Cryptology Research Fund (Fujian Normal University) (15002)
Qingdao application research on special independent innovation plan project (16-5-1-5-jch)