Tight Bounds for Differentially Private Anonymized Histograms

In this note, we consider the problem of differentially privately (DP) computing an anonymized histogram, which is defined as the multiset of counts of the input dataset (without bucket labels). In the low-privacy regime $ε\geq 1$, we give an $ε$-DP algorithm with an expected $\ell_1$-error bound of $O(\sqrt{n} / e^ε)$. In the high-privacy regime $ε< 1$, we give an $Ω(\sqrt{n \log(1/ε) / ε})$ lower bound on the expected $\ell_1$ error. In both cases, our bounds asymptotically match the previously known lower/upper bounds due to [Suresh, NeurIPS 2019].