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arXiv 2309.02416stat.AP
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差分隐私合成重尾数据

Differentially Private Synthetic Heavy-tailed Data

Tran Tran, Matthew Reimherr, Aleksandra Slavković

AI总结:

针对LBD合成数据缺乏可证明隐私的问题,提出基于差分隐私的KNG与分位数回归方法,以夹层顺序生成合成重尾数据,在相同隐私预算下提升数据效用。

摘要:

美国人口普查纵向商业数据库(LBD)产品包含自1976年以来所有美国企业和公司的就业与工资信息,是经济研究中宝贵的资源。然而,LBD中的敏感信息需要保密措施,美国人口普查局部分通过发布数据的合成版本(SynLBD)来解决,以保护企业隐私,同时确保其用于研究活动的可用性,但缺乏可证明的隐私保证。在本文中,我们提出使用差分隐私(DP)框架,该框架针对任意对手提供强大的可证明隐私保护,以生成具有正式隐私保证的合成重尾数据,同时保持高水平效用。我们提出使用K-范数梯度机制(KNG)与分位数回归进行DP合成数据生成。所提出的方法提供了众所周知的指数机制的灵活性,同时添加更少的噪声。我们提出以逐步和夹层顺序实施KNG,使得新的分位数估计依赖于先前采样的分位数,以更有效地使用隐私损失预算。生成具有正式隐私保证的合成重尾数据同时保持高水平效用,对数据管理者和研究人员来说是一个具有挑战性的问题。然而,我们通过模拟研究和在合成纵向商业数据库上的应用表明,在相同的隐私损失预算下,所提出的方法相对于原始KNG可以实现更好的数据效用。

英文摘要:

The U.S. Census Longitudinal Business Database (LBD) product contains employment and payroll information of all U.S. establishments and firms dating back to 1976 and is an invaluable resource for economic research. However, the sensitive information in LBD requires confidentiality measures that the U.S. Census in part addressed by releasing a synthetic version (SynLBD) of the data to protect firms' privacy while ensuring its usability for research activities, but without provable privacy guarantees. In this paper, we propose using the framework of differential privacy (DP) that offers strong provable privacy protection against arbitrary adversaries to generate synthetic heavy-tailed data with a formal privacy guarantee while preserving high levels of utility. We propose using the K-Norm Gradient Mechanism (KNG) with quantile regression for DP synthetic data generation. The proposed methodology offers the flexibility of the well-known exponential mechanism while adding less noise. We propose implementing KNG in a stepwise and sandwich order, such that new quantile estimation relies on previously sampled quantiles, to more efficiently use the privacy-loss budget. Generating synthetic heavy-tailed data with a formal privacy guarantee while preserving high levels of utility is a challenging problem for data curators and researchers. However, we show that the proposed methods can achieve better data utility relative to the original KNG at the same privacy-loss budget through a simulation study and an application to the Synthetic Longitudinal Business Database.

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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