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Due to successful applications of data analysis technologies in many fields,various institutions have accumulated a large amount of data to improve theirservices. As the speed of data collection has increased dramatically over thelast few years, an increasing number of users are growing concerned about theirpersonal information. Therefore, privacy preservation has become an urgentproblem to be solved. Differential privacy as a strong privacy preservationtool has attracted significant attention. In this survey, we focus on improvingutility of between differentially private mechanisms through technologiesrelated to cryptography. In particular, we firstly focus on how to improveutility through anonymous communication. Then, we summarize how to improveutility by combining differentially private mechanisms with homomorphicencryption schemes. Next, we summarize hardness results of what is impossibleto achieve for differentially private mechanisms' utility from the view ofcryptography. Differential privacy borrowed intuitions from cryptography andstill benefits from the progress of cryptography. To summarize thestate-of-the-art and to benefit future researches, we are motivated to providethis survey.

Improving Utility of Differentially Private Mechanisms through Cryptography-based Technologies: a Survey