Private Counting of Distinct and k-Occurring Items in Time Windows

Private Counting of Distinct and k-Occurring Items in Time Windows
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时间窗口中不同和 k 次出现的项目的私有计数

DOI:
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发表时间:
2022
期刊:
Information Technology Convergence and Services
影响因子:
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通讯作者:
Jelani Nelson
Jelani Nelson
中科院分区:
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文献类型:
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作者:
Badih Ghazi;Ravi Kumar;Pasin Manurangsi;Jelani Nelson

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在这项工作中,我们研究的任务,估计不同的和$k$出现的项目在一个时间窗口的约束下的差分隐私(DP)。我们考虑几个变量取决于查询是否是一般的时间窗口(时间t_1 $和t_2 $之间),或被限制为累积(时间t_1 $和t_2 $之间),并取决于DP相邻关系是否是事件级或更严格的项目级。我们获得了近紧的上限和下限的DP算法的错误,这些问题。在此过程中,我们获得了一个事件级DP算法,用于在每个时间步估计在最后$W$更新中看到的不同项目的数量,误差为$W$;这回答了Bolot等人的一个开放问题。(ICDT 2013)。
In this work, we study the task of estimating the numbers of distinct and $k$-occurring items in a time window under the constraint of differential privacy (DP). We consider several variants depending on whether the queries are on general time windows (between times $t_1$ and $t_2$), or are restricted to being cumulative (between times $1$ and $t_2$), and depending on whether the DP neighboring relation is event-level or the more stringent item-level. We obtain nearly tight upper and lower bounds on the errors of DP algorithms for these problems. En route, we obtain an event-level DP algorithm for estimating, at each time step, the number of distinct items seen over the last $W$ updates with error polylogarithmic in $W$; this answers an open question of Bolot et al. (ICDT 2013).