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arXiv 2602.09273cs.DScs.CR
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为近似最大约束满足问题付费:隐私价格

The Price of Privacy For Approximating Max-CSP

Rutgers University(罗格斯大学);Nanjing University(南京大学);Google Research(谷歌研究院);New York University(纽约大学);University of Wrocław(弗罗茨瓦夫大学)

Prathamesh Dharangutte, Jingcheng Liu, Pasin Manurangsi, Akbar Rafiey, Phanu Vajanopath, Zongrui Zou

AI总结:

本文研究了在差分隐私下近似最大约束满足问题的隐私成本,证明了高隐私下算法的近似比率上限,并提出了在有限度和三角形自由条件下达到该上限的多项式时间算法。

摘要:

我们研究了在差分隐私(DP)下最大约束满足问题(Max-CSPs)的近似算法,其中约束被视为敏感数据。从信息论的角度,我们旨在为给定的隐私预算ε分类最佳的近似比率。在高隐私范围内(ε << 1),我们证明任何ε-DP算法在近似比率上无法比随机分配好超过O(ε)。我们设计了一个多项式时间算法,在假设实例是有限度和三角形自由的条件下,该算法达到了这一障碍。最后,我们证明对于特定的CSPs,如最大割或最大k-XOR,可以移除一个或两个假设,但以计算效率为代价。

英文摘要:

We study approximation algorithms for Maximum Constraint Satisfaction Problems (Max-CSPs) under differential privacy (DP) where the constraints are considered sensitive data. Information-theoretically, we aim to classify the best approximation ratios possible for a given privacy budget $\varepsilon$. In the high-privacy regime ($\varepsilon \ll 1$), we show that any $\varepsilon$-DP algorithm cannot beat a random assignment by more than $O(\varepsilon)$ in the approximation ratio. We devise a polynomial-time algorithm which matches this barrier under the assumptions that the instances are bounded-degree and triangle-free. Finally, we show that one or both of these assumptions can be removed for specific CSPs--such as Max-Cut or Max $k$-XOR--albeit at the cost of computational efficiency.

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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