Remembering Peter Eckersley
Artwork by Hugh D’Andrade
Peter Eckersley, a Let’s Encrypt co-founder, passed away unexpectedly on September 2nd from complications of cancer...
A New Life for Certificate Revocation Lists
This month, Let’s Encrypt is turning on new infrastructure to support revoking certificates via Certificate Revocation Lists. Despite having been largely supplanted by the...
Nurturing Continued Growth of Our Oak CT Log
Let’s Encrypt has been running a Certificate Transparency (CT) log since 2019 as part of our commitment to keeping the Web PKI ecosystem healthy....
TLS Beyond the Web: How MongoDB Uses Let’s Encrypt for Database-to-Application Security
Most of the time, people think about using Let’s Encrypt certificates to encrypt the communication between a website and server. But connections that need...
Let’s Encrypt Receives the Levchin Prize for Real-World Cryptography
On April 13, 2022, the Real World Crypto steering committee presented the Max Levchin Prize for Real-World Cryptography to Let’s Encrypt. The following...
New Major Funding from the Ford Foundation
ISRG's pragmatic, public-interest approach to Internet security has fundamentally changed the web at an astonishing scale and pace. —Michael Brennan,...
FluBot’s Authors Employ Creative and Sophisticated Techniques to Achieve Their Goals in Version 5.0...
A deconstruction of FluBot 5.0’s new communication protocol and other capabilities FluBot uses to hide, making it difficult for researchers and security solutions to...
TLS Simply and Automatically for Europe’s Largest Cloud Customers
OVHcloud, the largest hosting provider in Europe, has used Let’s Encrypt for TLS certificates since 2016. Since then, they’ve provisioned tens of millions of...
Making the Web safer and more secure for everyone
The Internet Society has supported our work toward a 100% encrypted Web since before we’d even issued our first certificate. Their commitment to helping...
The 2021 TLS Telemetry Report
Creating an encrypted HTTPS website depends on a lot more than simply throwing a digital certificate at it and hoping for the best. In...
Latest article
Siemens KACO Blueplanet Inverters
View CSAF
Summary
KACO blueplanet Inverters contain multiple vulnerabilities that could allow an attacker to derive the credentials from the devices serial number and misuse them...
Windows Netlogon Remote Code Execution Vulnerability
What is the Vulnerability? A critical vulnerability, CVE-2026-41089, affecting the Windows...
Attackers exploiting unpatched Cisco SD-WAN flaw
Cisco warns customers of an actively exploited high-severity vulnerability in Catalyst SD-WAN Manager, an enterprise network management system that has...
ICYMI: May 2026 @AWS Security
Read all about the latest AWS security features, compliance updates, and hands-on resources in our new, monthly digest posts. You’ll find expert blog posts,...
