{"@attributes":{"version":"2.0"},"channel":{"title":"Work Portfolio: David Stainton","link":"https:\/\/sphinx.rs\/","description":"Recent content on Work Portfolio: David Stainton","generator":"Hugo","language":"en","lastBuildDate":"Tue, 04 Oct 2022 00:00:00 +0000","item":[{"title":"a messaging system for the katzenpost mix network","link":"https:\/\/sphinx.rs\/blog\/katzenpost_mixnet\/","pubDate":"Tue, 04 Oct 2022 00:00:00 +0000","guid":"https:\/\/sphinx.rs\/blog\/katzenpost_mixnet\/","description":"In light of the current political climate and the amount of surveillance we are all under it’s a pity end to end encrypted messaging systems aren’t using mixnets for their transport. However, mixnets are not messaging systems. A mix network is a transport protocol that can be used to compose various types of messaging systems.\nA few years ago I worked on an NLNet grant funding our work to make a messaging system for Katzenpost."},{"title":"cryptocomrade: Cryptography in Golang","link":"https:\/\/sphinx.rs\/blog\/golang_cryptography\/","pubDate":"Wed, 13 Jan 2021 00:00:00 +0000","guid":"https:\/\/sphinx.rs\/blog\/golang_cryptography\/","description":"In this blog post I will share with you how I write cryptography software in Go. This is a work in progress. I’ll periodically update this so as to fix mistakes and add more content. The cryptocomrade git repo is meant to accompany this blog post by providing code samples with a creative commons license (CC0):\nhttps:\/\/github.com\/david415\/cryptocomrade\nHowever I only added a few simple hash examples so far. I plan to add more soon."},{"title":"Contact","link":"https:\/\/sphinx.rs\/contact\/","pubDate":"Mon, 01 Jan 0001 00:00:00 +0000","guid":"https:\/\/sphinx.rs\/contact\/","description":"Contact Email: dstainton415@gmail.com Signal: dawuud.99 PGP: fingerprint ABE6 A811 FCC4 74C9 43FB 954D 7480 ADCD 29A7 C15A. Download the public key (ed25519, expires 2027-12-19). I don’t use keyservers, so the link above is the authoritative source. GitHub: github.com\/david415. I also contribute as part of the Katzenpost organization. LinkedIn: linkedin.com\/in\/davidstainton Twitter\/X: @david415 If you’re hiring for a senior cryptography \/ protocol engineering role at a privacy-focused team, email or Signal is the fastest way to reach me."},{"title":"David Stainton's Open Source Projects","link":"https:\/\/sphinx.rs\/projects\/","pubDate":"Mon, 01 Jan 0001 00:00:00 +0000","guid":"https:\/\/sphinx.rs\/projects\/","description":"See my github profile and the Katzenpost organisation for additional open source projects.\nPost-Quantum Cryptography and the Katzenpost Mix Network Katzenpost is a post-quantum mix network with strong metadata-privacy guarantees against global passive adversaries, compromised contacts, quantum decryption, and statistical\/confirmation attacks. It started as part of the EU Horizon 2020 Panoramix project in 2017, and I’ve been leading the cryptographic protocol work on it ever since.\nTwo post-quantum hybrid variants of the Sphinx packet format."},{"title":"David Stainton's technical writing","link":"https:\/\/sphinx.rs\/writing\/","pubDate":"Mon, 01 Jan 0001 00:00:00 +0000","guid":"https:\/\/sphinx.rs\/writing\/","description":"Writing Papers Echomix: a strong-adversary mix network design. arXiv preprint, self-published January 2025: https:\/\/arxiv.org\/abs\/2501.02933. Describes the Katzenpost mix network, the Pigeonhole storage protocol, BACAP, the PQ hybrid Sphinx variants, and the threat model. Katzenpost mix network specifications Pigeonhole protocol spec: unlinkable message storage with sharded replicas and blinded couriers. Pigeonhole explained: narrative overview. Group chat design: how group conversations are built on top of Pigeonhole. Classical Sphinx packet format spec. KEM Sphinx packet format spec: post-quantum hybrid variant."},{"title":"Public Speaking","link":"https:\/\/sphinx.rs\/publicspeaking\/","pubDate":"Mon, 01 Jan 0001 00:00:00 +0000","guid":"https:\/\/sphinx.rs\/publicspeaking\/","description":"An archive of the mix-network talks I gave around Europe between 2016 and 2019, at security, hacker, and privacy conferences. My goal in these talks was to make complex mixnet topics accessible to non-specialist audiences and to advocate for privacy enhancing technology. I believe untrained mathematical intuition is enough of a prerequisite for deeply technical content in cryptography and probability theory, if the talk is written for it.\nZero Knowledge Summit, September 2019, Berlin, Germany I hosted a mixnet workshop."}]}}