Key points are not available for this paper at this time.
The development of third-party hosting, IT out-sourcing, service clouds, etc. raises important security concerns. It is safer to encrypt critical data that is hosted by a third party. However, a database must be able to process queries on the encrypted data. Many algorithms have been developed to support search query processing on encrypted data, including order preserving encryption (OPE) schemes.
Xiao et al. (Thu,) studied this question.