[2605.01065] A Systematic Exploration of Text Decomposition and Budget Distribution in Differentially Private Text Obfuscation
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Computer Science > Computation and Language
arXiv:2605.01065 (cs)
[Submitted on 1 May 2026]
Title:A Systematic Exploration of Text Decomposition and Budget Distribution in Differentially Private Text Obfuscation
Authors:Stephen Meisenbacher, Angelo Kleinert, Florian Matthes
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Abstract:The goal of differentially private text obfuscation is to obfuscate, or "perturb", input texts with Differential Privacy (DP) guarantees, such that the private output texts are quantifiably indistinguishable from the originals. While perturbation at the word level is intuitive, meaningful text privatization happens on complete documents. Recent research has laid the groundwork for reasoning about privacy budget distribution, namely, how an overall $\varepsilon$ budget can be sensibly distributed among the component pieces of a text. We perform a systematic evaluation of multiple text decomposition and budget distribution techniques in the context of DP text obfuscation, testing how different methods for chunking texts can be combined with techniques for allocating $\varepsilon$ to these chunks. Our experiments reveal that such design choices are very important, as even with comparable privacy budgets, significantly different results can occur based on which methods are chosen. In this, we provide credible evidence of the feasibility of maximizing empirical trade-offs by optimizing DP obfuscation procedures.
Comments: 22 pages, 5 figures, 12 tables. Accepted to PrivateNLP 2026
Subjects:
Computation and Language (cs.CL)
Cite as: arXiv:2605.01065 [cs.CL]
(or arXiv:2605.01065v1 [cs.CL] for this version)
https://doi.org/10.48550/arXiv.2605.01065
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arXiv-issued DOI via DataCite (pending registration)
Submission history
From: Stephen Meisenbacher [view email] [v1] Fri, 1 May 2026 20:00:14 UTC (7,104 KB)
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