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The History and Impact of the ACME Protocol on Internet Security

By

coffee--

5mo ago· 21 min readenInsight

Summary

This article provides a comprehensive history and analysis of the ACME (Automated Certificate Management Environment) protocol, which revolutionized internet security by enabling automated SSL/TLS certificate issuance and management. The author, who has followed ACME for about ten years, explores the protocol's origins, development, standardization process, ecosystem relationships, and evolution challenges. The article includes insights from interviews with key figures involved in ACME's creation and evolution, including Aaron Gable, Sarah Gran, and Jacob Hoffman-Andrews. It also references the impact of Let's Encrypt and the protocol's significance in making HTTPS adoption widespread and accessible.

Key quotes

· 4 pulled
I would like to share with you this article I wrote about the ACME protocol, which I 'fell in love with' about ten years ago.
This article is about the roots, the conception, the standardization, the relation with its ecosystem and the evolution challenges faced by the ACME protocol.
To write this article, I had the privilege of interviewing several people who have been involved in the creation and the evolution of ACME: Aaron Gable, Sarah Gran, Jacob Hoffman-Andrews
It makes it jump in the TOP 25 on the HN homepage and in stats (31k reads after 24h, 45k after 15d) 💚
Snippet from the RSS feed
ACME, a brief history of one of the protocols which has changed the Internet Security Changelog 03 December 2025: article announced on Mastodon, LinkedIn and X. 03 December 2025: J.C. Jones published his reflections about 10 years of Let’s Encrypt. A must

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