International Association
for Cryptologic Research

Let’s Encrypt: Ten Years Encrypting the WebPeople deserve a secure and privacy-respecting Internet. Ubiquitous HTTPS is an essential part of delivering on that vision. To that end, our public benefit certificate authority has been issuing TLS certificates free of cost in a reliable, automated, and trustworthy manner for ten years. We went from issuing our first certificate in 2015 to servicing over 500,000,000 websites in 2025, and we’ve got big plans for the future. We’ll talk about how we got here and some lessons learned. We’ll also talk about what’s coming, from short lived certificates to the future of revocation and root generation.