Now back in HD: the CloudFlare Cryptography Meetup series. A while back, CloudFlare hosted a pair of Meetups focused on encryption and cryptographic technology. Now that CloudFlare HQ has moved into our beautiful new home at 101 Townsend in San Francisco, that we’ve decided to bring the crypto back. In this series, we’ve invited experts […]
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It takes two to ChaCha (Poly)
Not long ago we introduced support for TLS cipher suites based on the ChaCha20-Poly1305 AEAD, for all our customers. Back then those cipher suites were only supported by the Chrome browser and Google’s websites, but were in the process of standardization. We introduced these cipher suites to give end users on mobile devices the best […]
Come Geek Out With The Original Inventor of DNS at CloudFlare
We like DNS, we think you might too. CloudFlare and Gandi are hosting a three-part series on DNS. Our first event will be at the CloudFlare office with Paul Mockapetris, the original inventor of the Domain Name System. Beyond inventing DNS, Paul built the first ever SMTP server. He ran networking at ARPA, served as […]
Introducing CFSSL 1.2
Continuing our commitment to high quality open-source software, we’re happy to announce release 1.2 of CFSSL, our TLS/PKI Swiss Army knife. We haven’t written much about CFSSL here since we originally open sourced the project in 2014, so we thought we’d provide an update. In the last 20 months, we have added a ton of […]
The Trouble with Tor
The Tor Project makes a browser that allows anyone to surf the Internet anonymously. Tor stands for “the Onion router” and that describes how the service works. Traffic is routed through a number of relays run across the Internet where each relay only knows the next hop (because each hop is enclosed in a cryptographic […]
Going to IETF 95? Join the TLS 1.3 hackathon
If you’re in Buenos Aires on April 2-3 and are interested in building, come join the IETF Hackathon. CloudFlare and Mozilla will be working on TLS 1.3, the first new version of TLS in eight years! At the hackathon we’ll be focusing on implementing the latest draft of TLS 1.3 and testing interoperability between existing […]
TLS Certificate Optimization: The Technical Details behind “No Browser Left Behind”
Overview Back in early December we announced our “no browser left behind” initiative to the world. Since then, we have served well over 500 billion SHA-1 certificates to visitors that otherwise would not have been able to communicate securely with our customers’ sites using HTTPS. All the while, we’ve continued to present newer SHA-2 certificates […]
A Deep Dive Into DNS Packet Sizes: Why Smaller Packet Sizes Keep The Internet Safe
Yesterday we wrote about the 400 gigabit per second attacks we see on our network. One way that attackers DDoS websites is by repeatedly doing DNS lookups that have small queries, but large answers. The attackers spoof their IP address so that the DNS answers are sent to the server they are attacking, this is […]
A tale of a DNS exploit: CVE-2015-7547
This post was written by Marek Vavruša and Jaime Cochran, who found out they were both independently working on the same glibc vulnerability attack vectors at 3am last Tuesday. A buffer overflow error in GNU libc DNS stub resolver code was announced last week as CVE-2015-7547. While it doesn’t have any nickname yet (last year’s […]
Introducing CloudFlare Registrar: Designed for Security, Not the Masses
At CloudFlare, we’ve constructed one of the world’s largest networks purpose-built to protect our customers from a wide range of attacks. We’re so good at it that attackers increasingly look for ways to go around us, rather than go through us. One of the biggest risks for high-profile customers has been having their domain stolen […]
