PriFi: Low-Latency Anonymity for Organizational Networks

Anonymity Trilemma: Strong Anonymity, Low Bandwidth, Low Latency—Choose Two

This work investigates the fundamental constraintsof anonymous communication (AC) protocols. We analyze therelationship between bandwidth overhead, latency overhead, andsender anonymity or recipient anonymity against the globalpassive (network-level) adversary. We confirm the trilemma thatan AC protocol can only achieve two out of the following threeproperties: strong an...

PriFi: A Low-Latency Local-Area Anonymous Communication Network

Popular anonymity protocols such as Tor [15] provide low communication latency but are vulnerable to trafficanalysis attacks that can de-anonymize users. Traffic-analysis resistant protocols typically do not achieve low-latency communication (e.g., Dissent [58], Riffle [30]), or are restricted to a specific type of traffic (e.g., Herd [34], Aqua [33]). In this paper, we present PriFi, the first...

Improving Security and Performance in Low Latency Anonymity Networks

Impact of Network Topology on Anonymity and Overhead in Low-Latency Anonymity Networks

Low-latency anonymous communication networks require padding to resist timing analysis attacks, and dependent link padding has been proven to prevent these attacks with minimal overhead. In this paper we consider low-latency anonymity networks that implement dependent link padding, and examine various network topologies. We find that the choice of the topology has an important influence on the ...

Low Latency Anonymity with Mix Rings

We introduce mix rings, a novel peer-to-peer mixnet architecture for anonymity that yields low-latency networking compared to existing mixnet architectures. A mix ring is a cycle of continuous-time mixes that uses carefully coordinated cover traffic and a simple fan-out mechanism to protect the initiator from timing analysis attacks. Key features of the mix ring architecture include decoupling ...