ACME for Subdomains
Michael D. Richardson, Tim Hollebeek, Richard Barnes, Owen Friel · 2000
This document outlines how ACME can be used by a client to obtain a certificate for a subdomain identifier from a certificate authority. The client has fulfilled a challenge against a parent domain but does not need to fulfil a challenge against the explicit subdomain as certificate authority policy allows issuance of the subdomain certificate without explicit subdomain ownership proof.