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Alexandra Boldyreva Nathan Chenette Younho Lee Adam O'Neill Order-Preserving Symmetric Encryption. 224-241 2009 EUROCRYPT http://dx.doi.org/10.1007/978-3-642-01001-9_13 conf/eurocrypt/2009 db/conf/eurocrypt/eurocrypt2009.html#BoldyrevaCLO09