Funding for this research was provided by:
The Science and Technology Research Project of Department of Education of Jilin Province (201657)
Received: 21 November 2018
Accepted: 23 January 2019
First Online: 1 February 2019
: Binbin Yu: Ph.D. candidate, College of Computer Science and Technology, Jilin University. Lecturer, College of Information Technology and Media, Beihua University. His research interests include Network security and so on.
: The author declares that he has no competing interests.
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