Simon Willison • 12/10/2025

10 Years of Let's Encrypt

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This article celebrates the 10th anniversary of Let's Encrypt, detailing its journey from issuing its first publicly-trusted certificate in 2015 to becoming the world's largest certificate authority. It highlights key milestones, such as issuing a billion total certificates and protecting nearly one billion websites, and discusses the widespread adoption of the ACME protocol and the significant increase in HTTPS-encrypted web traffic.

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#http #web security #SSL Certificates
10 Years of Let's Encrypt

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