Privacy-Preserving Query Checking in Query Middleware

With the development of the grid technology used in business field, it becomes more and more important to preserve privacy in information sharing field. This paper proposes a privacy-preserving query middleware PPQM based on credible third party in grid database, and fulfill privacy-preserving checking algorithm in PPQM to make privacy-preserving optimization of query plan before query assignment, through experiments, PPQM can effectively preserve private information and improve secure query efficiency in the application of commercial environment.