Research on EchoMix

Katzenpost threat model document

Thu, 25 Apr 2024 00:00:00 +0000

Here we present a draft of the Katzenpost mixnet threat model document. We regard the threat model document as a living document which is frequently edited and in need of ongoing maintenance as we continue to develop newer mixnet protocols. Currently it is being organized by mixnet attack category and we have arranged attacks in a table with corresponding attacker capabilities. Later sections of the document present a deep dive into the core cryptographic protocols that comprise Katzenpost, namely these three:

Mixnet Literature Overview

Mon, 15 Apr 2024 00:00:00 +0000

We are presenting our overview of existing Mixnet literature. It takes some liberties with what is included or not. It proposes new ways to talk about some issues, and provides a critical analysis of some of the existing papers. It also endeavors to introduce the reader to the language of anonymity systems, while maintaining mathematical rigor.

This doc, in particular, does not talk about the Katzenpost design. It does introduce the reader to some of the reasons why we’ve been making certain design decisions, and a keen eye might be led to some of the similar conclusions. But here we focus on already published research. We also stick to theory and don’t focus on any practical systems being built today.

Katzenpost at 37C3

Sun, 28 Jan 2024 00:00:00 +0000

Dr. Eva Infeld and surveillance expert and developer Leif Ryge held a session at the Chaos Communication Congress about the current state of the project, some of the things we’re working on, and some of the pitfalls many anonymity systems fall into. Building an anonymity system fit for our dystopian age is a hard problem, but we’re doing it.

Audio Engineering Considerations for a Modern Mixnet

Sat, 25 Nov 2023 00:00:00 +0000

Modern Mixnets have a unique set of requirements when it comes to processing audio. The bandwidth is scarce, but we expect to use modern devices and have ample processing power. We aim to secure the communication against even sophisticated attacks that come from capturing the metadata, and prioritize tools that are free, open source and written with security in mind. In this unique setting, we present a set of recommendations for implementing codecs, DSPs, and sophisticated noise reduction tools, to deliver either impressive quality at low bandwidth or good quality at impressively low bandwidth.