College of Computer Science and Information Technology;
Central South University of Forestry&Technology;
Changsha;
410004;
China;
School of Computer and Communication Engineering;
Changsha University of Science and Technology;
Changsha;
410114;
China;
College of Engineering and Design;
Hunan Normal University;
Changsha;
410012;
China;
Cloud computing; SimHash; encryption image retrieval; K-means;