Funding for this research was provided by:
National Natural Science Foundation of China (61802033)
Postdoctoral Research Foundation of China (2018M643453)
Science and Technology projects in Sichuan Province (2019YJ0543)
the Opening Project of Guangdong Provincial Key Laboratory of Information Security Technology (2017B030314131)
Article History
Received: 24 April 2019
Accepted: 9 October 2019
First Online: 4 January 2020