1. School of Cyberspace Security, Beijing University of Posts and Telecommunications,Key Lab of Trustworthy Distributed Computing and Service, Ministry of Education,Beijing,China
2. School of Economics and Finance, Changchun Finance College,Key Lab of Trustworthy Distributed Computing and Service, Ministry of Education,Jilin,China
3. School of Computer Science, Beijing University of Posts and Telecommunications,Key Lab of Trustworthy Distributed Computing and Service, Ministry of Education,Beijing,China