Adaptive Gaussian Mechanism Based on Expected Data Utility under Conditional Filtering Noise

• Hai Liu,
• Zhenqiang Wu,
• Changgen Peng,
• Feng Tian,
• Laifeng Lu,

Vol. 12, No. 7, July 30, 2018
10.3837/tiis.2018.07.027 , Download Paper (Free):

• Sensitive information
• Differential privacy
• conditional filtering noise
• expected data utility
• adaptive Gaussian mechanism

Abstract

Differential privacy has broadly applied to statistical analysis, and its mainly objective is to ensure the tradeoff between the utility of noise data and the privacy preserving of individual’s sensitive information. However, an individual could not achieve expected data utility under differential privacy mechanisms, since the adding noise is random. To this end, we proposed an adaptive Gaussian mechanism based on expected data utility under conditional filtering noise. Firstly, this paper made conditional filtering for Gaussian mechanism noise. Secondly, we defined the expected data utility according to the absolute value of relative error. Finally, we presented an adaptive Gaussian mechanism by combining expected data utility with conditional filtering noise. Through comparative analysis, the adaptive Gaussian mechanism satisfies differential privacy and achieves expected data utility for giving any privacy budget. Furthermore, our scheme is easy extend to engineering implementation.

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