Cloudflare Research logo

Research Updates from the Cloudflare Blog

2021-11-08 Sizing Up Post-Quantum Signatures

How much room does TLS have for the big post-quantum signatures? We had a look: it’s tight.

2021-10-15 “Look, Ma, no probes!” — Characterizing CDNs’ latencies with passive measurement

A challenge with measuring and comparing network performance is the lack of large-scale global performance metrics, like RTT measurements. In this article we describe an alternative approach to active measurements, which accurately predicts network latencies using only passively collected data.

2021-10-15 Multi-User IP Address Detection

We’ve devised novel methods to detect multi-user IP addresses, and today we’re excited to announce their integration into our global threat intelligence products. These will improve the quality of our detection techniques and reduce false positives for our customers, and the clients that visit them.

2021-10-15 Geo Key Manager: Setting up a service for scale

Diagnosing scaling issues in a service associated with TLS termination through a deep dive into some of the incidents it caused.

2021-10-14 Privacy-Preserving Compromised Credential Checking

Announcing a public demo and open-sourced implementation of a privacy-preserving compromised credential checking service

2021-10-14 Unbuckling the narrow waist of IP: Addressing Agility for Names and Web Services

IP addresses associated with names, interfaces, and sockets, can tie these things together in a way that IP was never designed to support. This post describes Cloudflare efforts to decouple of IP addresses from names, the latest in a quest for something we’re calling Addressing Agility.

2021-10-14 Research Directions in Password Security

We've been studying password problems, including malicious logins using compromised credentials. Here's what we learned and here's where we think we can go from here with safer password systems.

2021-10-13 Cloudflare and the IETF

Cloudflare helps build a better Internet through collaboration on open and interoperable standards. This post will describe how Cloudflare contributes to the standardization process to enable incremental innovation and drive long-term architectural change.

2021-10-13 Pairings in CIRCL

Our Go cryptographic library CIRCL announces support for pairing-based cryptography.

2021-10-13 Exported Authenticators: The long road to RFC

Learn more about Exported Authenticators, a new extension to TLS, currently going through the IETF standardisation process.

2021-10-13 Coalescing Connections to Improve Network Privacy and Performance

Real world experiments for evaluating connection coalescing effects.

2021-10-12 Introducing SSL/TLS Recommender

Introducing customized recommendations to improve the security of your website.

2021-10-12 Dynamic Process Isolation: Research by Cloudflare and TU Graz

Cloudflare worked with TU Graz to study the impact of Spectre on Cloudflare Workers and to develop new defenses against it. Today we're publishing a paper about our research.

2021-10-12 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.

2021-10-12 Privacy Pass v3: the new privacy bits

A new version of Privacy Pass for reducing the number of CAPTCHAs.

2021-10-11 Announcing Cloudflare Research Hub

Announcing a new landing page where you can learn more about our research and additional resources.

2021-10-11 Internship Experience: Research Engineer

Over the summer of 2020 I interned at Cloudflare Research. This invaluable experience contributed to Cloudflare’s support of ODoH protocol, and I was awarded the best student paper award at PETS 2021.

2021-10-11 Cloudflare invites visiting researchers

As part of Cloudflare’s effort to build collaborations with academia, we host research focused internships all year long. Interns collaborate cross-functionally in research projects and are encouraged to ship code and write a blog post and a peer-reviewed publication at the end of their internship.

2021-10-10 Cloudflare Research: Two Years In

What Cloudflare Research has been up to for the last two years.

2021-10-01 Announcing The Cloudflare Distributed Web Gateways Private Beta: Unlocking the Web3 Metaverse and Decentralized Finance for Everyone

Cloudflare announces the Private Beta of their Web3 gateways for Ethereum and IPFS. Unlocking the Metaverse, Web3, and Decentralized Finance for every developer.

2021-10-01 Web3 — A vision for a decentralized web

In this blog we start to explain Web3 in the context of the web's evolution, and how Cloudflare might help to support it.

2021-09-30 How Cloudflare provides tools to help keep IPFS users safe

The Cloudflare IPFS module protects users from threats like phishing and ransomware.

2021-08-12 More devices, fewer CAPTCHAs, happier users

Today, we are taking another step in helping to reduce the Internet’s reliance on CAPTCHAs to prove that you are not a robot. We are expanding the reach of our Cryptographic Attestation of Personhood experiment by adding support for a much wider range of devices.

2021-08-12 Introducing Zero-Knowledge Proofs for Private Web Attestation with Cross/Multi-Vendor Hardware

In Cryptographic Attestation of Personhood the server sends a message to the browser that the hardware security signs, demonstrating its authenticity.

2021-07-01 Account Takeover Protection and WAF mitigations to help stop Global Brute Force Campaigns

Today, we are making our Account Takeover Protection capabilities available to all paid plans at no additional charge.

2021-05-13 Humanity wastes about 500 years per day on CAPTCHAs. It’s time to end this madness

An experiment that uses hardware security keys (like a YubiKey) to replace CAPTCHAs completely. The idea is rather simple: if a real human is sitting at their keyboard or uses their phone, they can touch their security key’s button or bring it near their phone to demonstrate that they are human.

2021-01-15 KEMTLS: Post-quantum TLS without signatures

The TLS 1.3 protocol has been around for quite some time, but it will be broken once quantum computers arrive. What can we do? In this blog post, we will examine a technique for achieving full post-quantum security for TLS 1.3 in the face of quantum computers: KEMTLS.

2021-01-13 A Name Resolver for the Distributed Web

At Cloudflare, we have been exploring alternative ways to resolve queries to responses that align with these attributes. We are proud to announce a new resolver for the Distributed Web, where IPFS content indexed by the Ethereum Name Service (ENS) can be accessed.

2020-12-11 Securing the post-quantum world

As quantum computing continues to mature, research and development efforts in cryptography are keeping pace. We’re working with academia and industry peers to help create a new set of cryptography standards that are resilient to attack from quantum computers.

2020-12-08 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.

2020-12-08 OPAQUE: The Best Passwords Never Leave your Device

Imagine passwords for online services that never leave your device, encrypted or otherwise. OPAQUE is a new cryptographic protocol that makes this idea possible, giving you and only you full control of your password.

2020-12-08 Helping build the next generation of privacy-preserving protocols

Today, we’re making several announcements around improving Internet protocols with respect to something important to our customers and Internet users worldwide: privacy.

2020-12-08 Improving DNS Privacy with Oblivious DoH in

Oblivious DoH (ODoH) makes secure DNS over HTTPS (DoH) queries into private queries which prevent the leakage of client IP addresses to resolvers. The new proposed ODoH standard addresses this problem and today we are enabling users to use this protocol with

2020-10-01 NTS is now an RFC

After much hard work, NTS finally becomes an official RFC.This means that Network Time Security (NTS) is officially part of the collection of protocols that makes the Internet work.

2019-11-01 Delegated Credentials for TLS

Today we’re happy to announce support for a new cryptographic protocol that helps make it possible to deploy encrypted services in a global network while still maintaining fast performance and tight control of private keys: Delegated Credentials for TLS.

2019-10-31 Announcing cfnts: Cloudflare's implementation of NTS in Rust

Several months ago we announced that we were providing a new public time service. Part of what we were providing was the first major deployment of the new Network Time Security protocol, with a newly written implementation of NTS in Rust.

2019-10-30 The TLS Post-Quantum Experiment

In June, we announced a wide-scale post-quantum experiment with Google. We implemented two post-quantum (i.e., not yet known to be broken by quantum computers) key exchanges, integrated them into our TLS stack and deployed the implementation on our edge servers and in Chrome Canary clients.

2019-10-29 DNS Encryption Explained

The Domain Name System (DNS) is the address book of the Internet. When you visit or any other site, your browser will ask a DNS resolver for the IP address where the website can be found. Unfortunately, these DNS queries and answers are typically unprotected.

2019-10-28 Supporting the latest version of the Privacy Pass Protocol

At Cloudflare, we are committed to supporting and developing new privacy-preserving technologies that benefit all Internet users. In November 2017, we announced server-side support for the Privacy Pass protocol, a piece of work developed in collaboration with the academic community.

2019-09-18 Cloudflare’s Approach to Research

Cloudflare’s mission is to help build a better Internet. One of the tools used in pursuit of this goal is computer science research. We’ve learned that some of the difficult problems to solve are best approached through research

2019-06-21 Introducing

Cloudflare has always been a leader in deploying secure versions of insecure Internet protocols and making them available for free for anyone to use. In 2014, we launched one of the world’s first free, secure HTTPS service (Universal SSL) to go along with our existing free HTTP plan.

2019-06-20 The Quantum Menace

The impact of quantum computing on cryptography conducts research and development towards a Post-Quantum era.

2019-06-20 Introducing CIRCL: An Advanced Cryptographic Library

Today we are proud to release the source code of a cryptographic library we’ve been working on: a collection of cryptographic primitives written in Go, called CIRCL.

2019-06-19 Cloudflare's Ethereum Gateway

Today, we are excited to announce Cloudflare's Ethereum Gateway, where you can interact with the Ethereum network without installing any software on your computer.

2019-03-18 Monsters in the Middleboxes: Introducing Two New Tools for Detecting HTTPS Interception

The practice of HTTPS interception continues to be commonplace on the Internet. This blog post discusses types of monster-in-the-middle devices and software, and how to detect them.

2018-09-21 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.

2018-09-17 Cloudflare goes InterPlanetary - Introducing Cloudflare’s IPFS Gateway

Today we’re excited to introduce Cloudflare’s IPFS Gateway, an easy way to access content from the the InterPlanetary File System (IPFS) that doesn’t require installing and running any special software on your computer.

2018-08-11 A Detailed Look at RFC 8446 (a.k.a. TLS 1.3)

TLS 1.3 (RFC 8446) was published today. This article provides a deep dive into the changes introduced in TLS 1.3 and its impact on the future of internet security.

2018-03-23 Introducing Certificate Transparency and Nimbus

Certificate Transparency (CT) is an ambitious project to help improve security online by bringing accountability to the system that protects HTTPS. Cloudflare is announcing support for this project by introducing two new public-good services.

2017-12-26 Why TLS 1.3 isn't in browsers yet

Upgrading a security protocol in an ecosystem as complex as the Internet is difficult. You need to update clients and servers and make sure everything in between continues to work correctly. The Internet is in the middle of such an upgrade right now.

2017-12-14 Inside the infamous Mirai IoT Botnet: A Retrospective Analysis

This post provides a retrospective analysis of Mirai — the infamous Internet-of-Things botnet that took down major websites via massive distributed denial-of-service using hundreds of thousands of compromised Internet-Of-Things devices.

2017-11-09 Privacy Pass - “The Math”

During a recent internship at Cloudflare, I had the chance to help integrate support for improving the accessibility of websites that are protected by the Cloudflare edge network.

2017-11-09 Cloudflare supports Privacy Pass

Cloudflare supports Privacy Pass, a recently-announced privacy-preserving protocol developed in collaboration with researchers from Royal Holloway and the University of Waterloo.

2017-09-26 Geo Key Manager: How It Works

Today we announced Geo Key Manager, a feature that gives customers control over where their private keys are stored with Cloudflare. This builds on a previous Cloudflare innovation called Keyless SSL and a novel cryptographic access control mechanism.

2017-07-10 High-reliability OCSP stapling and why it matters

At Cloudflare our focus is making the internet faster and more secure. Today we are announcing a new enhancement to our HTTPS service: High-Reliability OCSP stapling.