Cryptography 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.

hpqc - hybrid post quantum cryptography library

Fri, 12 Apr 2024 00:00:00 +0000

The Katzenpost developement team has recently released a new golang cryptography library known as hpqc. The theme of the library is hybrid post quantum cryptographic constructions, namely:

hybrid KEMs (key encapsulation mechanism)
hybrid NIKEs (non-interactive key exchange)
hybrid signature schemes

In each of the three main subdirectories, “kem”, “nike” and “sign” there exists interface definitions for Scheme, PrivateKey and PublicKey. For signature schemes and KEMs we’re borrowing the interface sets from cloudflare’s circl library.

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.