2025 marks ten years of Let’s Encrypt! 🎉 Already this year we’ve taken steps to continue delivering on our values of user privacy, efficiency, and innovation, all to further our goal of delivering free TLS certificates to as many people as possible. Our unofficial tagline for this tenth anniversary is “Encryption for Everybody.” It embodies our commitment to that goal, but it also captures the reality that technical innovation takes a village - and ours is a big village! It’s thanks to the thousands of volunteers providing free technical support via our community forum, our sponsors, countless individual donors, and others that Let’s Encrypt has scaled free TLS for a decade. Each month, we’ll be highlighting different sets of people who make our work possible. Who do you want to see recognized? What Let’s Encrypt use cases have amazed you? What do you hope we’ll improve on in the next ten years? Let us know in the comments or at outreach@letsencrypt.org! #LetsEncrypt10 #Encryption4Everybody #Cybersecurity #TLS https://lnkd.in/gzaSzn3P
Let's Encrypt
Technology, Information and Internet
San Francisco, California 2,739 followers
Building a more secure and privacy-respecting Internet for everyone.
About us
Let’s Encrypt is a free, automated, and open certificate authority (CA), run for the public’s benefit. It is a service provided by the Internet Security Research Group (ISRG). We give people the digital certificates they need in order to enable HTTPS (SSL/TLS) for websites, for free, in the most user-friendly way we can. We do this because we want to create a more secure and privacy-respecting Web. The key principles behind Let’s Encrypt are: Free: Anyone who owns a domain name can use Let’s Encrypt to obtain a trusted certificate at zero cost. Automatic: Software running on a web server can interact with Let’s Encrypt to painlessly obtain a certificate, securely configure it for use, and automatically take care of renewal. Secure: Let’s Encrypt will serve as a platform for advancing TLS security best practices, both on the CA side and by helping site operators properly secure their servers. Transparent: All certificates issued or revoked will be publicly recorded and available for anyone to inspect. Open: The automatic issuance and renewal protocol will be published as an open standard that others can adopt. Cooperative: Much like the underlying Internet protocols themselves, Let’s Encrypt is a joint effort to benefit the community, beyond the control of any one organization.
- Website
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https://letsencrypt.org/
External link for Let's Encrypt
- Industry
- Technology, Information and Internet
- Company size
- 11-50 employees
- Headquarters
- San Francisco, California
- Type
- Nonprofit
- Founded
- 2013
Locations
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Primary
Get directions
1 Letterman Dr
San Francisco, California 94129, US
Employees at Let's Encrypt
Updates
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Thanks to the Real World Crypto steering committee for inviting our Executive Director and co-founder Josh Aas to speak today. We always enjoy the opportunity to hang out with a bunch of cryptography people!
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Our Executive Director, Josh Aas, will be speaking at Real World Crypto Symposium (RWC) next week! Josh will delve into the journey from issuing our first Let’s Encrypt certificate 10 years ago to now servicing over 550M websites. He’ll cover lessons we’ve learned along the way, as well as our plans for the future. When: Thursday, March 27 at 1:35 EET as part of Session 3 on Web PKI and Open Source Learn more: https://lnkd.in/gRS6U5WH
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Will you be at #SREcon Americas next week? Be sure to catch the keynote by Matthew McPherrin, Technical Lead for our Let’s Encrypt SRE team. He’ll be diving into how we’ve strived to improve the working lives of SREs around the world since our launch 10 years ago, and how the SRE community has helped us in return. You’ll also hear about the history of Let’s Encrypt and helpful context for those managing TLS certificates. When: Tue, March 25 at 9:45 am PDT Where: Grand Ballroom ABGH Learn more: https://lnkd.in/gNWw3icJ
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Happy to join the Global Cyber Alliance!
🎉 ISRG has joined the Global Cyber Alliance! It’s just one more way we’re celebrating ten years of Encryption for Everybody. 2025 marks ten years of Let's Encrypt. Reaching that milestone has undoubtedly taken continual technical innovation—from automating renewals by developing ACME ten years ago, to making progress towards optional short-lived certs which we announced just this year. Alongside that technical innovation has been something no less important and just as remarkable: a community of people who’ve made our work possible. Collaboration is as central to what we do as automating certificates at global scale. With that spirit of collaboration and shared commitment to security and privacy at scale, we’re excited to have joined the the Global Cyber Alliance. Together along with the other 48 members of the coalition, we will continue to seek tangible results to benefit the security and privacy of everybody, everywhere. Read the full announcement from GCA here: https://lnkd.in/eJmhK_Zx
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Our first six-day cert is here! Yesterday, we issued our first short-lived certificate to ourselves. Next, we'll roll out short-lived certificates to a small group of our subscribers before making them widely available by the end of the year, alongside our standard 90-day certificates. Why does this matter? Shorter certificate lifetimes improve security by reducing the risk of compromised keys. Learn more about why they are important, how to get a short-lived cert (as available), see our test cert, and more in our latest blog post. Thanks to Open Technology Fund for supporting this work! https://lnkd.in/gNdT7nAe
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One of the standout moments of FOSDEM ‘25 for us was Executive Director Josh Aas’s keynote on Sunday afternoon. In it, he reflected on 10 years of Let’s Encrypt—from an ambitious idea to securing over 550 million domains today. Attendees got to hear what went into our decision ten years ago to create a Certificate Authority that provides free and easy to use TLS certificates, and why that was so important to us. They got a peek behind the curtain at how Let’s Encrypt operates, from the staff to the physical infrastructure and software stack. Josh talked about what’s coming next, including short-lived certificates and IP address support, ending OCSP support, and more ACME Renewal Info (ARI). He also shared what it takes to continue to operate Let’s Encrypt as a Certificate Authority that issues more than 6 million free certs every day and supports more than 550 million websites, and how you can help support that work. If you missed it, the video is available on FOSDEM’s website: https://lnkd.in/g2M7mjsX Want to learn more about how to support Let’s Encrypt? Check out our parent nonprofit ISRG’s website and become a sponsor! https://lnkd.in/eF7bR_4
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The Free and Open Source Developers' European Meeting (FOSDEM) is legendary for a reason: thousands of people, hundreds of talks, and an atmosphere that somehow turns cold Brussels drizzle into a warm, hopeful energy. This year was no exception. 2025 marked our second year at FOSDEM, and we were thrilled to be back! For many, this was their first time seeing Let’s Encrypt somewhere other than their terminal, and we loved hearing people’s stories and appreciation for making security easy. From "I can’t imagine setting up a website without Let's Encrypt" to "You saved me so much time," we had the joy of hearing from nearly 2,500 people in just two days. We left FOSDEM feeling inspired, grateful, and excited for the year ahead. Huge thanks to all the volunteers who made it possible! 👏 Until next year!
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Let's Encrypt reposted this
Let's Encrypt have evolved rate limits to better serve subscribers and keep the service healthy. Samantha Frank shares the details: https://lnkd.in/g9kDHYyG
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#ICYMI Last week ISRG Executive Director Josh Aas joined Red Sift CEO Rahul Powar and Sr Director of Sales Engineering Billy McDiarmid to talk about why we decided to retire our certificate expiration notification emails, and why we recommend Red Sift as a free monitoring solution for those who want to continue receiving notifications. Watch the webinar recording or read the written recap here: https://lnkd.in/giHTWrxB
We always encourage automating certificate renewal. The #ACME protocol was built for it, and there’s a strong software client ecosystem to support it. Automated renewal prevents operational delays, financial losses, and brand damage that comes from unexpected certificate expiration. But sometimes there’s nothing wrong with a “belt and suspenders” approach! Layering on certificate monitoring can provide visibility into your certificates and peace of mind. Tomorrow, we’re doing a webinar with Red Sift to talk about how to manage the growing number of TLS certificates. Register here! https://lnkd.in/gaQVxfcw