Karaoke: Distributed private messaging immune to passive traffic analysis

David Lazar, Yossi Gilad, Nickolai Zeldovich

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

42 Scopus citations

Abstract

Karaoke is a system for low-latency metadata-private communication. Karaoke provides differential privacy guarantees, and scales better with the number of users than prior such systems (Vuvuzela and Stadium). Karaoke achieves high performance by addressing two challenges faced by prior systems. The first is that differential privacy requires continuously adding noise messages, which leads to high overheads. Karaoke avoids this using optimistic indistinguishability: in the common case, Karaoke reveals no information to the adversary, and Karaoke clients can detect precisely when information may be revealed (thus requiring less noise). The second challenge lies in generating sufficient noise in a distributed system where some nodes may be malicious. Prior work either required each server to generate enough noise on its own, or used expensive verifiable shuffles to prevent any message loss. Karaoke achieves high performance using efficient noise verification, generating noise across many servers and using Bloom filters to efficiently check if any noise messages have been discarded. These techniques allow our prototype of Karaoke to achieve a latency of 6.8 seconds for 2M users. Overall, Karaoke's latency is 5× to 10× better than Vuvuzela and Stadium.

Original languageAmerican English
Title of host publicationProceedings of the 13th USENIX Symposium on Operating Systems Design and Implementation, OSDI 2018
PublisherUSENIX Association
Pages711-725
Number of pages15
ISBN (Electronic)9781939133083
StatePublished - 2007
Externally publishedYes
Event13th USENIX Symposium on Operating Systems Design and Implementation, OSDI 2018 - Carlsbad, United States
Duration: 8 Oct 201810 Oct 2018

Publication series

NameProceedings of the 13th USENIX Symposium on Operating Systems Design and Implementation, OSDI 2018

Conference

Conference13th USENIX Symposium on Operating Systems Design and Implementation, OSDI 2018
Country/TerritoryUnited States
CityCarlsbad
Period8/10/1810/10/18

Bibliographical note

Publisher Copyright:
© Proceedings of NSDI 2010: 7th USENIX Symposium on Networked Systems Design and Implementation. All rights reserved.

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