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Skip navigation links * Documentation * Get Help * Donate * Become a Sponsor * Current Sponsors and Funders * Get Involved * Additional Donation Information * About Us * Let's Encrypt * Internet Security Research Group (ISRG) * Frequently Asked Questions (FAQ) * Shortening the Let's Encrypt Chain of Trust * Policy and Legal Repository * Service Status * Statistics * Careers * Contact * Blog * Languages * ✓ English * Català * Čeština * Dansk * Deutsch * Greek * Español * Suomi * Français * עברית * Hungarian * Bahasa Indonesia * Italiano * 日本語 * 한국어 * Polish * Português do Brasil * Русский * සිංහල * Srpski * Svenska * Tamil * Thai * Türkçe * Українська * Tiếng Việt * 简体中文 * 繁體中文 A NONPROFIT CERTIFICATE AUTHORITY PROVIDING TLS CERTIFICATES TO 450 MILLION WEBSITES. READ ALL ABOUT OUR NONPROFIT WORK THIS YEAR IN OUR 2023 ANNUAL REPORT. Get Started Sponsor FROM OUR BLOG * Jul 23, 2024 INTENT TO END OCSP SERVICE Moving to a more privacy-respecting and efficient method of checking certificate revocation. Read more * Jun 24, 2024 MORE MEMORY SAFETY FOR LET’S ENCRYPT: DEPLOYING NTPD-RS NTP is critical to how TLS works, and now it’s memory safe at Let’s Encrypt. Read more * May 30, 2024 LET’S ENCRYPT CONTINUES PARTNERSHIP WITH PRINCETON TO BOLSTER INTERNET SECURITY Increasing defense against BGP attacks thanks to support from the Open Technology Fund. Read more * May 1, 2024 TAKEAWAYS FROM TAILSCALE’S ADOPTION OF ARI ACME Renewal Info (ARI) enables easy and automated cert revocation and replacement. Read more * Apr 25, 2024 AN ENGINEER’S GUIDE TO INTEGRATING ARI INTO EXISTING ACME CLIENTS Six steps developers can take to integrate ARI into an existing ACME client. Read more Subscribe via RSS MAJOR SPONSORS AND FUNDERS SUPPORT A MORE SECURE AND PRIVACY-RESPECTING WEB. Donate Let's Encrypt is a free, automated, and open certificate authority brought to you by the nonprofit Internet Security Research Group (ISRG). Read all about our nonprofit work this year in our 2023 Annual Report. 548 Market St, PMB 77519, San Francisco, CA 94104-5401, USA Send all mail or inquiries to: PO Box 18666, Minneapolis, MN 55418-0666, USA * GitHub * LinkedIn * Mastodon View our privacy policy. View our trademark policy. SUBSCRIBE FOR EMAIL UPDATES ABOUT LET'S ENCRYPT AND OTHER ISRG PROJECTS © 2024 Internet Security Research Group