A Framework for Adversarially Robust Streaming Algorithms

Omri Ben-Eliezer*, Rajesh Jayaram, David P. Woodruff, Eylon Yogev

*Corresponding author for this work

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


    We investigate the adversarial robustness of streaming algorithms. In this context, an algorithm is considered robust if its performance guarantees hold even if the stream is chosen adaptively by an adversary that observes the outputs of the algorithm along the stream and can react in an online manner. While deterministic streaming algorithms are inherently robust, many central problems in the streaming literature do not admit sublinear-space deterministic algorithms; on the other hand, classical space-efficient randomized algorithms for these problems are generally not adversarially robust. This raises the natural question of whether there exist efficient adversarially robust (randomized) streaming algorithms for these problems. In this work, we show that the answer is positive for various important streaming problems in the insertion-only model, including distinct elements and more generally $F-p$-estimation, Fp-heavy hitters, entropy estimation, and others. For all of these problems, we develop adversarially robust (1+ϵ)-approximation algorithms whose required space matches that of the best known non-robust algorithms up to a poly(log n, 1/ϵ) multiplicative factor (and in some cases even up to a constant factor). Towards this end, we develop several generic tools allowing one to efficiently transform a non-robust streaming algorithm into a robust one in various scenarios.

    Original languageEnglish
    Title of host publicationPODS 2020 - Proceedings of the 39th ACM SIGMOD-SIGACT-SIGAI Symposium on Principles of Database Systems
    PublisherAssociation for Computing Machinery
    Number of pages18
    ISBN (Electronic)9781450371087
    StatePublished - 14 Jun 2020
    Event39th ACM SIGMOD-SIGACT-SIGAI Symposium on Principles of Database Systems, PODS 2020 - Portland, United States
    Duration: 14 Jun 202019 Jun 2020

    Publication series

    NameProceedings of the ACM SIGACT-SIGMOD-SIGART Symposium on Principles of Database Systems


    Conference39th ACM SIGMOD-SIGACT-SIGAI Symposium on Principles of Database Systems, PODS 2020
    Country/TerritoryUnited States


    • adversarial robustness
    • databases
    • distinct elements
    • frequency moments
    • heavy hitters
    • streaming algorithms


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