Abstract
Frequent Itemset Hiding has long been an area of study for privacy-preserving data mining. The goal is to alter a dataset so that it may be released without revealing particular sensitive aggregates (e.g., frequent itemsets or association rules.) Typically the approach is to remove items from transactions to reduce the support of the sensitive itemset(s) below a threshold, while minimizing the changes or impact on other frequent itemsets. In this paper, we ask if such hiding can be discovered: Do hiding methods lead to anomalies that suggest that a sensitive itemset likely existed in the dataset, and has been hidden? We show that a suppressed sensitive itemset may behave like an outlier among its neighboring itemsets after suppression, indicating that the dataset is likely altered. KL-divergence and \(\chi ^2\)-divergence are used to calculate the difference between expected and actual probability distributions of itemsets for observing anomalous behavior. Experimental results on four datasets show that suppressed sensitive itemsets often stand out as the most significant outlier in many cases, irrespective of the victim item selection method. We propose two defensive approaches that counter this attack.
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The datasets used during the current study are available on the GitHub platform link https://github.com/ShaliniJangra/Attack_Defense and online repository https://www.philippe-fournier-viger.com/spmf/index.php?link=datasets.php.
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This work is funded by Science and Engineering Research Board (SERB), a statutory body under the Department of Science and Technology (DST), Government of India.
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Shalini Jangra: Conception and design of study, Acquisition of data, Coding and Implementation, Analysis and interpretation of Results, Writing- Original draft preparation, Review & Editing, Funding acquisition Durga Toshniwal: Review & Editing, Supervision Chris Clifton: Conceptualization, Methodology, Analysis and interpretation of Results, Review & Editing, Supervision
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Shalini, J., Durga, T. & Chris, C. Statistical limitations of sensitive itemset hiding methods. Appl Intell 53, 24275–24292 (2023). https://doi.org/10.1007/s10489-023-04781-4
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DOI: https://doi.org/10.1007/s10489-023-04781-4