The Loopix Anonymity System
summary
Loopix is a deployed mix network that uses Poisson mix delays and three cover types—drop messages, client loops and mix-generated loops—to mask who talks to whom while supporting offline inbox service providers. The paper includes a theoretical analysis, an AWS EC2 implementation and measurements showing mix nodes handle ~300 messages per second, per-node crypto adds <1.5 ms overhead, and end-to-end latencies fit a gamma distribution (common median ~1.5 s for the evaluated setting).
AI-written summary · about
chapters (17)
- 0:00Introduction
- 0:29What is Loopix
- 1:32Mixed Networks
- 3:11Loopix Overview
- 5:13Real Traffic
- 5:33Drop Cover Traffic
- 6:12Clients Loop Messages
- 7:37Mix Node Loop Messages
- 8:13Poisson Process
- 10:38Poisson Mix
- 12:51Security Properties
- 16:02Entropy
- 17:44Bandwidth
- 19:20Latency Overhead
- 20:06Delays
- 21:13Key takeaways
- 22:12Questions
related talks
06mNetwork-level Anonymity and Transaction Privacy
08mPrivacy and Security
17mBoomerang: Metadata-Private Messaging under Hardware Trust
15mLXM: Better Splittable Pseudorandom Number Generators (and Almost as Fast)
27mMetadata-private data transfer
17mFlock: A Framework for Deploying On-Demand Distributed Trust
25mMulti-messenger Security: Adaptive Kubernetes SOC...
39mPufferfish Privacy Mechanisms for Correlated Data