Worst-case linkage of ℓ-diverse datasets can collapse anonymity to a single sensitive value, and the proposed (ℓ,δ)-diversity guarantee, with a sample-independent mechanism and a union-bound composition theorem, keeps the relaxation intact under linkage.
Bayardo and Rakesh Agrawal
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$(\ell,\delta)$-Diversity: Linkage-Robustness via a Composition Theorem
Worst-case linkage of ℓ-diverse datasets can collapse anonymity to a single sensitive value, and the proposed (ℓ,δ)-diversity guarantee, with a sample-independent mechanism and a union-bound composition theorem, keeps the relaxation intact under linkage.