no code implementations • 28 Sep 2020 • Amos Beimel, Iftach Haitner, Kobbi Nissim, Uri Stemmer
Combining this primitive with the two-round semi-honest protocol of Applebaun et al. [TCC 2018], we obtain that every randomized functionality can be computed in the shuffle model with an honest majority, in merely two rounds.
no code implementations • 10 Mar 2020 • Noga Alon, Amos Beimel, Shay Moran, Uri Stemmer
Let~$\cH$ be a class of boolean functions and consider a {\it composed class} $\cH'$ that is derived from~$\cH$ using some arbitrary aggregation rule (for example, $\cH'$ may be the class of all 3-wise majority-votes of functions in $\cH$).
no code implementations • 18 Dec 2019 • Amos Beimel, Aleksandra Korolova, Kobbi Nissim, Or Sheffet, Uri Stemmer
Motivated by the desire to bridge the utility gap between local and trusted curator models of differential privacy for practical applications, we initiate the theoretical study of a hybrid model introduced by "Blender" [Avent et al.,\ USENIX Security '17], in which differentially private protocols of n agents that work in the local-model are assisted by a differentially private curator that has access to the data of m additional users.
no code implementations • 27 Feb 2019 • Amos Beimel, Shay Moran, Kobbi Nissim, Uri Stemmer
The building block for this learner is a differentially private algorithm for locating an approximate center point of $m>\mathrm{poly}(d, 2^{\log^*|X|})$ points -- a high dimensional generalization of the median function.
no code implementations • 31 Oct 2018 • Amos Beimel, Ronen I. Brafman
In privacy-preserving multi-agent planning, a group of agents attempt to cooperatively solve a multi-agent planning problem while maintaining private their data and actions.
no code implementations • 10 Jul 2014 • Amos Beimel, Kobbi Nissim, Uri Stemmer
We show that the sample complexity of these tasks under approximate differential privacy can be significantly lower than that under pure differential privacy.
no code implementations • 10 Jul 2014 • Amos Beimel, Kobbi Nissim, Uri Stemmer
In 2008, Kasiviswanathan et al. (FOCS 2008) gave a generic construction of private learners, in which the sample complexity is (generally) higher than what is needed for non-private learners.
no code implementations • 10 Feb 2014 • Amos Beimel, Kobbi Nissim, Uri Stemmer
Kasiviswanathan et al. gave a generic construction of private learners for (finite) concept classes, with sample complexity logarithmic in the size of the concept class.