Published file metadata, source observations, indicators, and research history in one bounded catalog.
128Reachable catalog records
3 / 6Current catalog page
24Maximum records per page
0Samples downloaded by this page
Feed collection status
Sources represented on this page. Publication and observation dates describe the content; successful batch dates describe local collection. A recent batch does not certify complete coverage or current provider availability.
src_823f7b237762257237Collection status unverifiedLast successful batch: Unverified
Stale means older than twice the recorded collection interval, with a minimum of one hour; without an interval, the threshold is 24 hours. Cached content remains available while a feed is stale, paused, or unverified.
128 MATCHING RECORDSMETADATA ONLY / SOURCE ATTRIBUTION PRESERVED
Update, May 13, 2021 Please visit this post on our community forum for the latest information about chain changes as some information about the changes and dates in this blog post is outdated. We’re happy to announce that we have developed a way for older Android devices to retain their ability to visit sites that use Let’s Encrypt certificates after our cross-signed intermediates expire. We are n
First reported Dec 21, 2020 00:00 UTCCatalog metadata updated Oct 08, 2026 03:47 UTCOpen evidence record
Let’s Encrypt has improved how we manage Online Certificate Status Protocol (OCSP) responses by deploying Redis and generating responses on-demand rather than pre-generating them, making us more reliable than ever. About OCSP Responses OCSP is used to communicate the revocation status of TLS certificates. When an ACME agent signs a request to revoke a certificate, our Let’s Encrypt Certificate Aut
First reported Dec 15, 2022 00:00 UTCCatalog metadata updated Oct 08, 2026 03:47 UTCOpen evidence record
Following our previous post on the foundational benefits of ACME Renewal Information (ARI), this one offers a detailed technical guide for incorporating ARI into existing ACME clients. Since its introduction in March 2023, ARI has significantly enhanced the resiliency and reliability of certificate revocation and renewal for a growing number of Subscribers. To extend these benefits to an even broa
First reported Apr 25, 2024 00:00 UTCCatalog metadata updated Oct 08, 2026 03:47 UTCOpen evidence record
When we look at the general security posture of Let’s Encrypt, one of the things that worries us most is how much of the operating system and network infrastructure is written in unsafe languages like C and C++. The CA software itself is written in memory safe Golang, but from our server operating systems to our network equipment, lack of memory safety routinely leads to vulnerabilities that need
First reported Jun 24, 2024 00:00 UTCCatalog metadata updated Oct 08, 2026 03:47 UTCOpen evidence record
Artwork by Hugh D’Andrade Peter Eckersley, a Let’s Encrypt co-founder, passed away unexpectedly on September 2nd from complications of cancer treatment. As an incredibly kind, bright, and energetic person, he was a beloved member of the community of people working to make the Internet a better place. He played an important role in the founding of Let’s Encrypt and his loss is felt deeply by many i
First reported Sep 12, 2022 00:00 UTCCatalog metadata updated Oct 08, 2026 03:47 UTCOpen evidence record
As planned, the DST Root CA X3 has expired and we’re now using our own ISRG Root X1 for trust. We used a cross-sign with DST Root CA X3 to gain broad trust for our certificates when we were just starting out. Now our own root is widely trusted. For most websites, it was just another day on the Internet, but inevitably with such a big change some sites and configurations have issues. Our overview o
First reported Oct 01, 2021 00:00 UTCCatalog metadata updated Oct 08, 2026 03:47 UTCOpen evidence record
At ISRG, we often say, “as a nonprofit, 100% of our funding comes from charitable contributions.” But what does that actually look like? For nearly a decade, the vast majority of our funding has come from sponsorships—in fact, more than $17 million dollars has been donated to ISRG since 2015. Looking to the year ahead, we wanted to take a moment to thank our renewing sponsors who, quite literally,
First reported Jan 19, 2023 00:00 UTCCatalog metadata updated Oct 08, 2026 03:47 UTCOpen evidence record
This letter was originally published in our 2022 annual report. The past year at ISRG has been a great one and I couldn’t be more proud of our staff, community, funders, and other partners that made it happen. Let’s Encrypt continues to thrive, serving more websites around the world than ever before with excellent security and stability. A particularly big moment was when Let’s Encrypt surpassed 3
First reported Dec 05, 2022 12:00 UTCCatalog metadata updated Oct 08, 2026 03:47 UTCOpen evidence record
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 certificates for their shared hosting customers. We often get asked about how large integrations work and their best practices so this will be the first in a series of blog posts we’ll publish on the topic. OVHcloud first started looking into
First reported Oct 28, 2021 00:00 UTCCatalog metadata updated Oct 08, 2026 03:47 UTCOpen evidence record
On Thursday, June 6th, 2024, we will be switching issuance to use our new intermediate certificates. Simultaneously, we are removing the DST Root CA X3 cross-sign from our API, aligning with our strategy to shorten the Let’s Encrypt chain of trust. We will begin issuing ECDSA end-entity certificates from a default chain that just contains a single ECDSA intermediate, removing a second intermediate
First reported Apr 12, 2024 00:00 UTCCatalog metadata updated Oct 08, 2026 03:47 UTCOpen evidence record
Since its inception, Let’s Encrypt has been sending expiration notification emails to subscribers that have provided an email address to us. We will be ending this service on June 4, 2025. The decision to end this service is the result of the following factors: Over the past 10 years more and more of our subscribers have been able to put reliable automation into place for certificate renewal. Prov
First reported Jan 22, 2025 00:00 UTCCatalog metadata updated Oct 08, 2026 03:47 UTCOpen evidence record
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 Online Certificate Status Protocol for over a decade now, CRLs are gaining new life with recent browser updates. By collecting and summarizing CRLs for their users, browsers are making reliable revocation of certificates a reali
First reported Sep 07, 2022 00:00 UTCCatalog metadata updated Oct 08, 2026 03:47 UTCOpen evidence record
Since March 2023, Let’s Encrypt has been improving our resiliency and reliability via ACME Renewal Information (ARI). ARI makes it possible for our Subscribers to handle certificate revocation and renewal easily and automatically. A primary benefit of ARI is that it sets Subscribers up for success in terms of ideal renewal times in the event that Let’s Encrypt offers certificates with even shorter
First reported May 01, 2024 00:00 UTCCatalog metadata updated Oct 08, 2026 03:47 UTCOpen evidence record
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 TLS are everywhere! In order for us to have an Internet that is 100% encrypted, we need to think beyond the website. MongoDB’s managed multicloud database service, called Atlas, uses Let’s Encrypt certificates to secure the connection between cu
First reported Apr 28, 2022 00:00 UTCCatalog metadata updated Oct 08, 2026 03:47 UTCOpen evidence record
This letter was originally published in our 2024 Annual Report. The past year at ISRG has been a great one and I couldn’t be more proud of our staff, community, funders, and other partners that made it happen. Let’s Encrypt continues to thrive, serving more websites around the world than ever before with excellent security and stability. Our understanding of what it will take to make privacy-prese
First reported Dec 11, 2024 00:00 UTCCatalog metadata updated Oct 08, 2026 03:47 UTCOpen evidence record
For more than ten years, we at the nonprofit Internet Security Research Group (ISRG) have been focused on our mission of building a more secure and privacy-respecting Internet for everyone, everywhere. As we touch on in our 2023 Annual Report, we now serve more than 360 million domains with free TLS certificates. Beyond being a big number, what does that signify? What’s the importance of having TL
First reported Dec 13, 2023 00:00 UTCCatalog metadata updated Oct 08, 2026 03:47 UTCOpen evidence record
A filename, label, or report mention alone does not establish maliciousness. Observation dates describe cited sources; collection dates describe this local metadata catalog. No malware samples are stored, fetched, or executed by these pages.