Anonymity Trilemma: Strong Anonymity, Low Bandwidth Overhead, Low Latency - Choose Two

This work investigates the fundamental constraints of anonymous communication (AC) protocols. We analyze the relationship between bandwidth overhead, latency overhead, and sender anonymity or recipient anonymity against the global passive (network-level) adversary. We confirm the trilemma that an AC...

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Bibliographic Details
Main Authors: Das, Debajyoti, Meiser, Sebastian, Mohammadi, Esfandiar, Kate, Aniket
Format: Conference Proceeding
Language:English
Subjects:
AC protocols
anonymity
Bandwidth
Cryptography
Petri nets
Privacy
Protocols
Synchronization
trilemma
Online Access:Request full text
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Summary:This work investigates the fundamental constraints of anonymous communication (AC) protocols. We analyze the relationship between bandwidth overhead, latency overhead, and sender anonymity or recipient anonymity against the global passive (network-level) adversary. We confirm the trilemma that an AC protocol can only achieve two out of the following three properties: strong anonymity (i.e., anonymity up to a negligible chance), low bandwidth overhead, and low latency overhead. We further study anonymity against a stronger global passive adversary that can additionally passively compromise some of the AC protocol nodes. For a given number of compromised nodes, we derive necessary constraints between bandwidth and latency overhead whose violation make it impossible for an AC protocol to achieve strong anonymity. We analyze prominent AC protocols from the literature and depict to which extent those satisfy our necessary constraints. Our fundamental necessary constraints offer a guideline not only for improving existing AC systems but also for designing novel AC protocols with non-traditional bandwidth and latency overhead choices.
ISSN:2375-1207
DOI:10.1109/SP.2018.00011