Talek: Private Group Messaging with Hidden Access Patterns

Cheng, Raymond; Scott, William G.; Masserova, Elisaweta; Zhang, Irene; Goyal, Vipul; Anderson, Thomas E.; Parno, Bryan

doi:10.1145/3427228.3427231

Cited by 12 publications

(2 citation statements)

References 63 publications

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“…Talek [17] (2020) introduces a private group messaging system that aims to provide privacy for its users via access sequence indistinguishability. Talek's core abstraction is a private log, that enables a single writer to share messages with many readers.…”

Section: Private-read Based Systemsmentioning

confidence: 99%

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SoK: Metadata-Protecting Communication Systems

Sasy,

Goldberg

2024

PoPETs

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Protecting metadata of communications has been an area of active research since the dining cryptographers problem was introduced by David Chaum in 1988. The Snowden revelations from 2013 resparked research in this direction. Consequently over the last decade we have witnessed a flurry of novel systems designed to protect metadata of users' communications online. However, such systems leverage different assumptions and design choices to achieve their goal; resulting in a scattered view of the desirable properties, potential vulnerabilities, and limitations of existing metadata-protecting communication systems (MPCS). In this work we survey 31 systems targeting metadata-protected communications, and present a unified view of the current state of affairs. We provide two different taxonomies for existing MPCS, first into four different categories by the precise type of metadata protections they offer, and next into six families based on the core techniques that underlie them. By contrasting these systems we identify potential vulnerabilities, as well as subtle privacy implications of design choices of existing MPCS. Furthermore, we identify promising avenues for future research for MPCS, and desirable properties that merit more attention.

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Section: Private-read Based Systemsmentioning

confidence: 99%

“…Asynchronous Constructions. PIR can be leveraged to design asynchronous MPCS, as seen in Express [30], Talek [17], and Sabre [70]. The only other asynchronous design is Loopix (mixnet), but it requires trusting service provider nodes to support asynchrony.…”

Section: A Largest Experiments Reportedmentioning

confidence: 99%