The article provides a comprehensive overview of the ACME protocol, which has significantly influenced internet security through the automation of certificate management. Developed alongside Let’s Encrypt, ACME allows client software to prove control over a domain to obtain TLS certificates without manual intervention. This automation was essential from the outset, enabling Let’s Encrypt to issue over 700 million active certificates and drive HTTPS adoption from about 39% to nearly 95% in the U.S. over the last decade. J.C. Jones, a key figure behind Let’s Encrypt, highlights the challenges of obtaining and managing server-side certificates as a major barrier to widespread encryption. Collaborators from organizations like Mozilla and the Electronic Frontier Foundation joined forces in 2013 to create Let’s Encrypt as a free, automated certificate authority. Automation through ACME was not just a convenience; it was a necessity for scaling operations effectively within a limited budget. The article emphasizes the importance of verifying control over a domain rather than ownership, outlining the different challenge types (HTTP, DNS, TLS) a client might encounter when interacting with an ACME-compatible certificate authority. The article also reflects on the broader context of internet protocols, tracing their evolution from the 1990s to today. It notes how the rise of the internet created a communication utopia, initially lacking security measures. The revelations from Edward Snowden in 2013 underscored the urgency for encryption, leading to the establishment of Let’s Encrypt and the implementation of ACME. Through interviews with key contributors, the piece captures the collaborative spirit that fueled the protocol's development and the ongoing efforts to enhance internet security.