1. National Engineering Research Center for Big Data Technology and System, Services Computing Technology and System Lab, Hubei Engineering Research Center on Big Data Security, School of Cyber Science and Engineering, Huazhong University of Science and Technology, Wuhan, China
2. National Engineering Research Center for Big Data Technology and System, Services Computing Technology and System Lab, Cluster and Computing Lab, School of Computer Science and Technology, Huazhong University of Science and Technology, Wuhan, China
3. Department of Information Systems and Cyber Security and the Department of Electrical and Computer Engineering, The University of Texas at San Antonio, San Antonio, TX, USA