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Encryption provides a method to protect data outsourced to a DBMS provider,e.g., in the cloud. However, performing database operations over encrypted datarequires specialized encryption schemes that carefully balance security andperformance. In this paper, we present a new encryption scheme that canefficiently perform equi-joins over encrypted data with better security thanthe state-of-the-art. In particular, our encryption scheme reduces the leakageto equality of rows that match a selection criterion and only reveals thetransitive closure of the sum of the leakages of each query in a series ofqueries. Our encryption scheme is provable secure. We implemented ourencryption scheme and evaluated it over a dataset from the TPC-H benchmark.

Equi-Joins Over Encrypted Data for Series of Queries