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Nick Sullivan

@nicksullivan.org
968 followers 882 following 107 posts

Asymmetries in action

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Nick Sullivan @nicksullivan.org · 04/09/2026
We've extended the deadline by a week. You've got until 11 September. The submissions have been amazing so far, it should be a great event. You can choose whether we publish your paper or proposal in the proceedings or keep it for the in-person conversation. www.ietf.org/blog/iab-pq-...
ietf.org
Post-Quantum Authentication: Up Next
Post-quantum key establishment has moved from standards into deployment. Post-quantum authentication has not moved nearly as far, and specification work is no longer the only constraint. The IAB is ho...
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Nick Sullivan @nicksullivan.org · 21/08/2026
The IAB is running a workshop on deploying post-quantum authentication, the harder, lagging half of the PQ transition: certs, HSMs, identity, firmware & software signing. Prague, Oct 11–12, co-located with OpenSSL. CFP + how to submit (by Sep 4): datatracker.ietf.org/group/pqws/a...
datatracker.ietf.org
IAB Workshop on Accelerating the Deployment of Post-Quantum Authentication (pqws)
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Mark X @markmx.bsky.social · 30/07/2026
Great news! Germ DM is now quantum secure! We’re deploying post-quantum cryptography (PQC) in 3.0.9, available today. 1/7
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Nick Sullivan @nicksullivan.org · 24/07/2026
If you weren't aware, I had a small part in helping design TLS 1.3 back in the day. Today, I presented some new work at the TLS working group meeting in Vienna to upgrade its the key schedule from SHA-2 (the workhorse) to Keccak, the algorithm behind SHA-3. www.ietf.org/archive/id/d...
ietf.org
XOF-based key schedules for TLS 1.3
TLS 1.3 runs its entire key schedule on HKDF over SHA-2. This document defines an extension that replaces that schedule with one built on an extendable-output function (XOF): the negotiated KDF gove...
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Nick Sullivan @nicksullivan.org · 11/07/2026
The CFRG is holding a last call for two documents on hybrid KEMs: a mechanism that lets you safely combine a post-quantum KEM and a classical algorithm into a single construction. mailarchive.ietf.org/arch/msg/cfr... Reply on-list if you agree this should be published or have technical concerns.
mailarchive.ietf.org
[CFRG] RG Last Call on draft-irtf-cfrg-hybrid-kems-12 and draft-irtf-cfrg-concrete-hybrid-kems-04
Search IETF mail list archives
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Nick Sullivan @nicksullivan.org · 07/07/2026
It feels disingenuous to recognize the difference between an informational RFC published by the IETF and the Independent Submission stream, but not recognize the difference between standards track and informational RFCs. Is an RFC and RFC, or do you care about the Category: and Stream: at the top?
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Nick Sullivan @nicksullivan.org · 28/04/2026
Every lock needs a key. The hard part is not always designing the lock. Sometimes it is getting the key to the person who needs it. That is the problem I look at in the third post in my CDT series on Encrypted Client Hello. cdt.org/insights/dis...
cdt.org
Distributing the Keys for Private Access to the Web
Breaking the DNS Dependencych-22" class="toc-anchor">ECH’s Catch-22thing-strange-in-the-dns" href="#something-strange-in-the-dns" class="toc-anchor">Something Strange in the DNS use it. That’s the fun...
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Nick Sullivan @nicksullivan.org · 14/04/2026
I'm in Toronto discussing how websites can specify their preferences regarding how their content is used by search engines and AI crawlers. Here's what we have so far:
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Nick Sullivan @nicksullivan.org · 09/04/2026
Want to help shape the cryptography that ends up in Internet standards? CFRG is looking for Crypto Review Panel members. Self-nominations welcome. Two-year renewable term. Send nominations by April 20: cfrg-chairs@ietf.org wiki.ietf.org/group/cfrg/C...
wiki.ietf.org
Crypto Review Panel
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Nick Sullivan @nicksullivan.org · 07/04/2026
ECH exposed a hard truth about privacy technology: you can win at the protocol layer and still lose at the deployment layer. I wrote about it here: cdt.org/insights/do-...
cdt.org
Do Not Stick Out: The Dynamics of the ECH Rollout
Lessons Learned-ech-traffic-stuck-out" href="#why-ech-traffic-stuck-out" class="toc-anchor">Why ECH Traffic Stuck Out">The Paradox of Privacy Adoption: Standing Out to Disappearss="toc-anchor">Case St...
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Nick Sullivan @nicksullivan.org · 17/03/2026
www.platformer.news/instagram-en...
platformer.news
Why Meta is retreating from encryption
In 2019, Mark Zuckerberg called privacy the future of social networking. Not anymore
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Nick Sullivan @nicksullivan.org · 11/03/2026
I had a wonderful time at RWC again this year. What a lovely group of people.
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Real World Crypto Symposium @rwc.iacr.org · 10/03/2026
The room gets philosophical. Cryptography & Society chaired by Nick Sullivan ( @nicksullivan.org ): what is crypto hiding from itself? Security vs. interoperability? CRA policy? Proofs that aren't enough? And Nadim Kobeissi on teaching crypto in post-crisis Lebanon. #realworldcrypto
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Nick Sullivan @nicksullivan.org · 08/03/2026
I’m back in Taipei for Real World Crypto, then Tokyo next week for IETF by proxy. Let me know if you’re around!
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Nick Sullivan @nicksullivan.org · 04/03/2026
Encrypted Client Hello is now RFC 9849 This RFC defines an extension to Transport Layer Security that improves privacy for web users. Huge team effort and a win for the internet at large. Now to get deployment up... Some words I wrote about this for @cdt.org: cdt.org/insights/enc...
cdt.org
Encrypted Client Hello: Closing the SNI Metadata Gap
Referencesent-deployment-and-adoption" href="#current-deployment-and-adoption" class="toc-anchor">Current Deployment and Adoptionor">Trial by Firewall-security-systems" href="#adapting-network-securit...
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Nick Sullivan @nicksullivan.org · 01/03/2026
I put together a job site for cryptography roles. It's in alpha, so please send me your bugs! jobs.cryptography.consulting
jobs.cryptography.consulting
CryptoJobs - Cryptography Career Opportunities
The definitive job board for cryptography professionals. Find opportunities in post-quantum cryptography, zero-knowledge proofs, HSM, TLS/PKI, and applied cryptographic research.
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Nick Sullivan @nicksullivan.org · 27/01/2026
I’m happy to be joining the USENIX Security ’26 Enigma organizing committee this year, after having the chance to speak at Enigma three times. It has a long history as a home for early, practice-driven security ideas, often where work first gets aired before it’s fully polished or widely deployed.
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Nick Sullivan @nicksullivan.org · 15/01/2026
AI coding is an earthquake for software security. Not a tremor. The kind that liquefies the ground beneath your feet. We're mid-shake and most people are still debating if it's real. 🔗 github.blog/news-insight...
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Real World Crypto Symposium @rwc.iacr.org · 09/01/2026
Registration for Real World Crypto 2026 is now open! rwc.iacr.org/2026/registr...
rwc.iacr.org
RWC 2026 registration
Real World Crypto Symposium
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Nick Sullivan @nicksullivan.org · 09/01/2026
News! I’ll be joining the Internet Architecture Board(IAB) starting March 2026 at IETF 125 in Shenzhen(I’ll be participating remotely). The IAB is part of the IETF ecosystem. It looks across Internet protocol work to provide architecture-level oversight and help keep the standards process healthy.
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Center for Democracy & Technology @cdt.org · 18/12/2025
CDT’s @npdoty.techpolicy.social.ap.brid.gy and Visiting Fellow @nicksullivan.org joined a UN OHCHR workshop in Madrid with engineers, industry, and civil society to explore how technical standards affect internet users’ human rights. Read their recap of the event:
cdt.org
Embedding Human Rights in Technical Standard-Setting: Institutional Change and Governance
Standards engineers discussing support for human rights in technical standards This July, just before a week of meetings on internet protocol details in Madrid, CDT invited a group of engineers — leaders from industry and civil society and participants in the Internet Engineering Task Force and World Wide Web Consortium — to a workshop organized […]
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Arturo Filastò @hellais.bsky.social · 09/12/2025
At #IETF124 in Montréal @ietf.org last month I gave a talk about Measuring & Understanding ECH deployments as @ooni.org. ECH is becoming a Frontline for whether the Internet remains Open, Private, and Resilient. We need to Document Censorship, to Protect our Internet. 📹 youtu.be/OmBNQKZtO3Q
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Nick Sullivan @nicksullivan.org · 30/11/2025
The “cosmic-ray bit-flip” thing actually being real and serious enough to recall every A320 on the planet was not on my 2025 bingo card.
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Nick Sullivan @nicksullivan.org · 17/11/2025
This is an obvious but important result, but I'm not a fan of this characterization of poisoning as an attack. There are legitimate reasons to poison, especially if you consider an AI company to be the malicious party rather than the victim. www.anthropic.com/research/sma...
anthropic.com
A small number of samples can poison LLMs of any size
Anthropic research on data-poisoning attacks in large language models
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Nick Sullivan @nicksullivan.org · 06/11/2025
The first ARMOR meeting was a success with 4 great presentations on different aspects of real-world protocol resilience by @vinifortuna.com , Brien Colwell, @distributeddave.bsky.social , and @hellais.bsky.social.
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Center for Democracy & Technology @cdt.org · 23/10/2025
New guest post from CDT Visiting Fellow & IETF expert @nicksullivan.org: Encrypted Client Hello (ECH) closes the final major privacy gap in HTTPS by encrypting the Server Name Indication (SNI) — a milestone for online privacy. 🌐 Read more:
cdt.org
Encrypted Client Hello: Closing the SNI Metadata Gap
Referencesent-deployment-and-adoption" href="#current-deployment-and-adoption" class="toc-anchor">Current Deployment and Adoptionor">Trial by Firewall-security-systems" href="#adapting-network-security-systems" class="toc-anchor">Adapting Network Security Systemsy-sni-became-the-last-privacy-gap" class="toc-anchor">Why SNI Became the Last Privacy Gapre-metadata-leaks" class="toc-anchor">Background: Where Metadata Leakste, whether governments like it or not. Encrypted Client Hello (ECH) is nearing final IETF standardization [1]. It closes the last remaining metadata leak in HTTPS connections by encrypting the Server Name […]
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Nick Sullivan @nicksullivan.org · 21/10/2025
Here are seven things I’m looking forward to in the next month. Tomorrow, I’ll be guest lecturing with Kyle Hogan at NYU for Sunoo Park’s class on public interest tech. The theme: bikeshedding and how to get things done in internet standards.
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Nick Sullivan @nicksullivan.org · 30/09/2025
Global network interference and traffic disruption are on the rise. In 2024, governments in 41 countries blocked websites and in 25 countries entire social platforms were restricted (freedomhouse.org/report/freed...).
freedomhouse.org
The Struggle for Trust Online
Around the world, voters have been forced to make major decisions about their future while navigating a censored, distorted, and unreliable information space.
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Joseph Lorenzo Hall, PhD @josephhall.org · 10/08/2025
Continuing our look at the Enigma track talks is "Fighting Fire with Venom: Adversarial Defense Against Unauthorized Web Crawling," presented by independent technologist Nick Sullivan. 1/3
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Nick Sullivan @nicksullivan.org · 13/08/2025
Tomorrow on USENIX Security’s Enigma track, I’ll unveil Venom, a new framework to sting back at rogue AI web crawlers with some adversarial mischief. If you’re around Seattle, come say hi or ping me! www.usenix.org/conference/u...
usenix.org
Fighting Fire with Venom: Adversarial Defense Against Unauthorized Web Crawling | USENIX
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Nick Sullivan @nicksullivan.org · 21/07/2025
The digital identity space is approaching a dangerous precipice. newdesigncongress.org/en/note/2025...
newdesigncongress.org
The Mask-Off Moment for Digital Identity
Our 18-month investigation reveals how digital identity systems create brittle societies. This foreword traces eight case studies that demonstrate the catastrophic failures of digital identity across ...
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Real World Crypto Symposium @rwc.iacr.org · 13/07/2025
The Call for Contributed Talks is now open for RWC 2026! And the deadline for submissions is now Oct. 10, 2025. rwc.iacr.org/2026/contrib...
rwc.iacr.org
RWC 2026 call for papers
Real World Crypto Symposium
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Nick Sullivan @nicksullivan.org · 07/07/2025
Here are the slides from my recent keynote on post-quantum cryptography and Q-Day. www.linkedin.com/posts/ntsull...
linkedin.com
🏗️ A TALE OF THREE BRIDGES AND THE COMING QUANTUM RECKONING | Nick Sullivan
🏗️ A TALE OF THREE BRIDGES AND THE COMING QUANTUM RECKONING Two months ago in Berlin I delivered a keynote on post‑quantum cryptography at Visa Risk Reset, an invitation‑only summit for CROs, CISOs, r...
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Nick Sullivan @nicksullivan.org · 07/07/2025
Good read: a detailed and accessible report published on @chinafile by Jessica Batke and Laura Edelson on China's internet censorship system, known as the "Locknet" locknet.chinafile.com/the-locknet/...
locknet.chinafile.com
The Locknet: How China Controls Its Internet and Why It Matters
June 30, 2025 The man gazes earnestly into the camera, the glow from his computer monitor reflecting off his black-rimmed glasses. “This is more than just a cultural moment,” he says with a smile. “It...
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Nick Sullivan @nicksullivan.org · 05/06/2025
Fascinating House Judiciary hearing going on live right now: Influence on Americans' Data Through the CLOUD Act. Big focus on the UK and Apple's E2E backup system. www.youtube.com/watch?v=QJgw...
youtube.com
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Nick Sullivan @nicksullivan.org · 30/05/2025
I’m going to hold off on using the term artificial intelligence to describe this current generation of products and just call them what they are: language models. Until they gain mathematical and symbolic reasoning skills, the term “intelligence” is a stretch.
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Nick Sullivan @nicksullivan.org · 23/05/2025
Germ is launching support for open-source AT Protocol and the Bluesky platform in their Germ messenger. Everything I want in a messaging app: strong encryption, clean UX, and trust & safety tied to social identity. A big move for private messaging and I can't be prouder to be an advisor.
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Nick Sullivan @nicksullivan.org · 28/03/2025
These last 5 weeks have been a thrill and a half. Now fly me home…
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Real World Crypto Symposium @rwc.iacr.org · 26/03/2025
For those following from home (or still in your hotel rooms), here’s the link for the live stream: youtube.com/live/R1NEfuv...
youtube.com
RWC 2025
YouTube video by Real World Crypto
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Nick Sullivan @nicksullivan.org · 25/03/2025
Excited to share that we’ve just updated the CFRG Process documentation, clarifying guidelines on document lifecycle, roles, and collaboration within the CFRG. If you’re proposing or managing CFRG work, this is essential reading! wiki.ietf.org/en/group/cfr...
wiki.ietf.org
Crypto Forum Research Group Process
Overview of CFRG process and best practices
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Nick Sullivan @nicksullivan.org · 22/03/2025
I had to go visit her. She’s glorious. #moodeng
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Nick Sullivan @nicksullivan.org · 16/03/2025
If you haven't been tracking, RCS texting is rolling out end-to-end encryption using MLS. This is a huge triumph of the IETF and the collaborative approach to creating internet-grade protocols championed there. arstechnica.com/gadgets/2025...
arstechnica.com
RCS texting updates will bring end-to-end encryption to green bubble chats
Lack of encryption was one SMS shortcoming that RCS was created to solve.
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Nick Sullivan @nicksullivan.org · 03/03/2025
There’s going to be an impedance mismatch when people treat an organization as if it’s supposed to just do what they want instead of understanding what it’s actually chartered to do and why. In this case thinking the CFRG is a standards publication venue and not an advisory group for the IETF.
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Nick Sullivan @nicksullivan.org · 01/03/2025
This is tomorrow. If you’re going, let me know! surf.mozilla.org/events/2025/...
surf.mozilla.org
Mozilla Security Research Summit, San Diego 2025
Mozilla Security Research Summit San Diego 2025
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Nick Sullivan @nicksullivan.org · 27/02/2025
URnetwork, a new privacy-focused VPN I’ve been helping with just launched on ProductHunt! Check it out, it’s slick. www.producthunt.com/posts/urnetw...
producthunt.com
URnetwork - Say goodbye to your VPN and hello to a P2P powered web | Product Hunt
We’re rebuilding the internet so that you can say goodbye to your VPN and never again make the tradeoff between the content you want and privacy. Introducing URnetwork, a decentralized network powered...
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Nick Sullivan @nicksullivan.org · 21/02/2025
I’m attending RightsCon in Taipei next week. Want to talk encryption, censorship and privacy? Let me know.
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Nick Sullivan @nicksullivan.org · 19/02/2025
The tentative program for Real World Crypto 2025 is live! rwc.iacr.org/2025/program... A huge thanks to my co-chair @malb.bsky.social and all the amazing program committee members for helping put this together. I'm looking forward to seeing everyone in Sofia! #realworldcrypto
rwc.iacr.org
RWC 2025 program
Real World Crypto Symposium
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Martin R. Albrecht @malb.bsky.social · 02/02/2025
The list of accepted talk at @rwc.iacr.org is now available: rwc.iacr.org/2025/accepte... Early registration ends 26 February. CC: programme co-chair @nicksullivan.org
rwc.iacr.org
RWC 2025 accepted papers
Real World Crypto Symposium
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Nick Sullivan @nicksullivan.org · 03/02/2025
Everyone knows your location: tracking myself down through in-app ads - tim.sh timsh.org/tracking-mys...
timsh.org
Everyone knows your location
How I tracked myself down using leaked location data in the in-app ads, and what I found along the way.
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Nick Sullivan @nicksullivan.org · 31/01/2025
Security isn't just confidentiality—availability matters too. That's why I'm joining @cendemtech.bsky.social part-time as a Visiting Fellow to work on censorship resistance and privacy online. I’ve been turning my literature review into a podcast with help from AI if you want to follow along.
censorshipandsafeguards.podbean.com
Censorship & Safeguards: Strengthening Internet Protocols | Nick Sullivan
This podcast series examines how internet censorship shapes global access to information and the technical safeguards needed to ensure a free and open web. We dive into the mechanics of filtering, cir...
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