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Christopher Patton










July 9, 2026
Why we cannot wait for better post-quantum signature algorithms

NIST is advancing nine new post-quantum signature algorithms as potential candidates for future standardization. We take a closer look at all of them, and argue that while they are in the works and show great potential, we should use ML-DSA for now — the best currently available.




Bas Westerbaan and Christopher Patton















October 30, 2025
Anonymous credentials: rate-limiting bots and agents without compromising privacy

As AI agents change how the Internet is used, they create a challenge for security. We explore how Anonymous Credentials can rate limit agent traffic and block abuse without tracking users or compromising their privacy.




Thibault Meunier,Christopher Patton,Lena Heimberger, and Armando Faz-Hernández















October 30, 2025
Policy, privacy and post-quantum: anonymous credentials for everyone

The world is adopting anonymous credentials for digital privacy, but these systems are vulnerable to quantum computers. This post explores the cryptographic challenges and promising research paths toward building new, quantum-resistant credentials from the ground up.




Lena Heimberger and Christopher Patton















October 28, 2025
Keeping the Internet fast and secure: introducing Merkle Tree Certificates

Cloudflare is launching an experiment with Chrome to evaluate fast, scalable, and quantum-ready Merkle Tree Certificates, all without degrading performance or changing WebPKI trust relationships.




Luke Valenta,Christopher Patton,Vânia Gonçalves, and Bas Westerbaan















March 21, 2025
Prepping for post-quantum: a beginner’s guide to lattice cryptography

This post is a beginner's guide to lattices, the math at the heart of the transition to post-quantum (PQ) cryptography. It explains how to do lattice-based encryption and authentication from scratch.




Christopher Patton and Peter Schwabe















March 19, 2025
An early look at cryptographic watermarks for AI-generated content

It's hard to tell the difference between web content produced by humans and web content produced by AI. We're taking new approach to making AI content distinguishable without impacting performance.




Teresa Brooks-Mejia and Christopher Patton















September 29, 2023
Post-quantum cryptography goes GA

Cloudflare announces Post-Quantum Cryptography as a Generally Available system




Wesley Evans,Bas Westerbaan,Christopher Patton,Peter Wu, and Vânia Gonçalves















September 29, 2023
Privacy-preserving measurement and machine learning

Cloudflare is implementing DAP (Distributed Aggregation Protocol) – a way of aggregating data without exposing individual measurements that uses multi-party computation




Christopher Patton and Mari Galicer















August 4, 2022
Experiment with post-quantum cryptography today

The future is post quantum. Enable post-quantum key agreement on your test zone today and get a headstart




Bas Westerbaan,Christopher Patton, and Peter Wu















October 12, 2021
Handshake Encryption: Endgame (an ECH update)

In this post, we’ll dig into ECH details and describe what this protocol does to move the needle to help build a better Internet.




Christopher Wood and Christopher Patton















December 8, 2020
Good-bye ESNI, hello ECH!

A deep dive into the Encrypted Client Hello, a standard that encrypts privacy-sensitive parameters sent by the client, as part of the TLS handshake.




Christopher Patton















September 21, 2018
Roughtime: Securing Time with Digital Signatures

When you visit a secure website, it offers you a TLS certificate that asserts its identity. Every certificate has an expiration date, and when it’s passed due, it is no longer valid.




Christopher Patton

















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