摘要
1 Introduction With the rapid development of cloud computing,more and more data are stored in cloud servers as cyphertexts for storage[1,2].However,it faces enormous challenges regarding ciphertext analysis.For example,in the cloud medical services,authorized medical institutions(AMIs)need analyze medical records to figure out gender and age information on patients with the same disease.
基金
The work was supported by the National Natural Science Foundation of China(Grant No.61702005),the Special Fund for Key Program of Science and Technology of Anhui Province,China(18030901027).The authors are very grateful to the anonymous referees for their detailed comments and suggestions regarding this paper.
