Local Obfuscation Mechanisms for Hiding Probability Distributions

Local Obfuscation Mechanisms for Hiding Probability Distributions
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隐藏概率分布的局部混淆机制

DOI:
10.1007/978-3-030-29959-0_7
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发表时间:
2019
期刊:
Proc. of the 24th European Symposium on Research in Computer Security (ESORICS 2019), Part I, Lecture Notes in Computer Science
影响因子:
--
通讯作者:
Yusuke Kawamoto and Takao Murakami
Yusuke Kawamoto and Takao Murakami
中科院分区:
--
文献类型:
--
作者:
Kohei Nishino;Takashi Kitamura;Tomoji Kishi;Cyrille Artho;Yutaka Matsuno;Yusuke Kawamoto and Takao Murakami

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We introduce a formal model for the information leakage of probability distributions and define a notion called distribution privacy as the local differential privacy for probability distributions. Roughly, the distribution privacy of a local obfuscation mechanism means that the attacker cannot significantly gain any information on the distribution of the mechanism’s input by observing its output. Then we show that existing local mechanisms can hide input distributions in terms of distribution privacy, while deteriorating the utility by adding too much noise. For example, we prove that the Laplace mechanism needs to add a large amount of noise proportionally to the infinite Wasserstein distance between the two distributions we want to make indistinguishable. To improve the tradeoff between distribution privacy and utility, we introduce a local obfuscation mechanism, called a tupling mechanism, that adds random dummy data to the output. Then we apply this mechanism to the protection of user attributes in location based services. By experiments, we demonstrate that the tupling mechanism outperforms popular local mechanisms in terms of attribute obfuscation and service quality.
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