Privacy preserving query processing on secret share based data storage

Database as a Service(DaaS) is a paradigm for data management in which the Database Service Provider(DSP), usually a professional third party for data management, can host the database as a service. Many security and query problems are brought about because of the possible untrusted or malicious DSP in this context. Most of the proposed papers are concentrated on using symmetric encryption to guarantee the confidentiality of the delegated data, and using partition based index to help execute the privacy preserving range query. However, encryption and decryption operations on large volume of data are time consuming, and query results always consist of many irrelevant data tuples. Different from encryption based scheme, in this paper, we present a secret share based scheme to guarantee the confidentiality of delegated data. And what is more important, we construct a privacy preserving index to accelerate query and to help return the exactly required data tuples. Finally we analyze the security properties and demonstrate the efficiency and query response time of our approach through empirical data.