Information Security Center Key Laboratory of Networking and Switching Technology University of Posts and Telecommunications;
School of Information Science and Technology China University of Technology;
Department of Computer Science Textile University;
Inner Mongolia University of Science&Technology of Information Engineering;
State Key Laboratory of Media Convergence and Communication University of China;
School of Computer Science and Cybersecurity University of China;
Key Laboratory of Convergent Media and Intelligent Technology Communication University of China of Education;
Blockchain; privacy protection; smart contract; public encryption keyword search;