Brian Thompson Stuart Haber William G. Horne Tomas Sander Danfeng Yao Privacy-Preserving Computation and Verification of Aggregate Queries on Outsourced Databases. 185-201 2009 Privacy Enhancing Technologies http://dx.doi.org/10.1007/978-3-642-03168-7_11 conf/pet/2009 db/conf/pet/pets2009.html#ThompsonHHSY09