摘要：Cloud servers could provide secure services to data management for encrypted sensitive data, however, the difficulties of querying these data by data owners increase.To solve the problem,this paper proposes a new scheme for range queries over encrypted data. In particular, the indices and interval trapdoors of sensitive data are first created by using circle mapping. Then, these indices and interval trapdoors are encrypted. During range query processing, cloud servers can efficiently retrieve and return query results after completing an assertion. Moreover, the correctness, security and computation complexity are presented and analyzed in details. Compared with the existing approaches, this method is more efficient and secure.
