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arXiv 2209.15596cs.CRcs.LGstat.ML
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基于高斯差分隐私的个体隐私核算

Individual Privacy Accounting with Gaussian Differential Privacy

Nokia Bell Labs(诺基亚贝尔实验室);Helsinki Institute for Information Technology HIIT(赫尔辛基信息技术研究所);University of Helsinki(赫尔辛基大学);Department of Computer Science, University of Helsinki(赫尔辛基大学计算机科学系)

Antti Koskela, Marlon Tobaben, Antti Honkela

AI总结:

该研究针对个体隐私核算需求,基于高斯差分隐私开展分析,结合上鞅与Rényi散度相关结果,构建了近似的个体(ε,δ)-隐私核算器,填补了最优隐私核算器在个体隐私损失分析领域的空白。

摘要:

个体隐私核算能够为参与分析的每个参与者单独界定差分隐私(DP)损失。这一方法颇具实用价值,因为个体隐私损失通常远小于那些基于每次数据访问最坏情况边界得出的DP边界所指示的损失。为了以系统化的方式核算个体隐私损失,我们需要一种适用于随机机制自适应组合的隐私核算器,允许单次数据访问产生的损失小于最坏情况损失。Feldman与Zrnic(2021)已针对Rényi差分隐私(RDP)开展了此类分析,但尚未应用于所谓的最优隐私核算器。我们通过利用高斯差分隐私开展细致分析,在该方向迈出了第一步——高斯差分隐私能为高斯机制(最通用的DP机制之一)提供最优边界。该方法基于为曲棍球棒散度确定某一上鞅,并拓展Feldman和Zrnic提出的基于Rényi散度的完全自适应组合结果。我们还研究了利用所谓的隐私损失分布来度量个体(ε,δ)-隐私损失。借助Blackwell定理,我们可以利用RDP分析构建一个近似的个体(ε,δ)-核算器。

英文摘要:

Individual privacy accounting enables bounding differential privacy (DP) loss individually for each participant involved in the analysis. This can be informative as often the individual privacy losses are considerably smaller than those indicated by the DP bounds that are based on considering worst-case bounds at each data access. In order to account for the individual privacy losses in a principled manner, we need a privacy accountant for adaptive compositions of randomised mechanisms, where the loss incurred at a given data access is allowed to be smaller than the worst-case loss. This kind of analysis has been carried out for the Rényi differential privacy (RDP) by Feldman and Zrnic (2021), however not yet for the so-called optimal privacy accountants. We make first steps in this direction by providing a careful analysis using the Gaussian differential privacy which gives optimal bounds for the Gaussian mechanism, one of the most versatile DP mechanisms. This approach is based on determining a certain supermartingale for the hockey-stick divergence and on extending the Rényi divergence-based fully adaptive composition results by Feldman and Zrnic. We also consider measuring the individual $(\varepsilon,δ)$-privacy losses using the so-called privacy loss distributions. With the help of the Blackwell theorem, we can then make use of the RDP analysis to construct an approximative individual $(\varepsilon,δ)$-accountant.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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