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Fri, 17 Apr 2026 06:37:22 -0700 (PDT) Received: from smtpclient.apple ([216.245.86.140]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-50e392c7b26sm12610481cf.5.2026.04.17.06.37.21 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Fri, 17 Apr 2026 06:37:21 -0700 (PDT) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3864.500.181\)) From: Shiloh Heurich In-Reply-To: Date: Fri, 17 Apr 2026 09:37:11 -0400 Content-Transfer-Encoding: quoted-printable Message-Id: <1C14DDF1-9CFD-4A57-ABF5-D186038E0896@heurich.com> References: <0548587B-B211-4BC9-8F4F-51F30EC555E0@heurich.com> To: Seo Suchan X-Mailer: Apple Mail (2.3864.500.181) Message-ID-Hash: 3WT2FZ2D2672O5GIC4TJCSJLHAAKPG2B X-Message-ID-Hash: 3WT2FZ2D2672O5GIC4TJCSJLHAAKPG2B X-MailFrom: shiloh@heurich.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-acme.ietf.org-0; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: acme@ietf.org X-Mailman-Version: 3.3.9rc6 Precedence: list Subject: =?utf-8?q?=5BAcme=5D_Re=3A_Potential_issues_with_dns-persist-01?= List-Id: Automated Certificate Management Environment Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: > On Apr 17, 2026, at 08:09, Seo Suchan wrote: >=20 > How hard for an ACME CA to remember every public keys an account = was/is tied to? Not hard to track in a database table; the problem is what it does to = revocation. If old key thumbprints stay valid indefinitely, then key rotation no = longer revokes the old key's authority over persistent records. An = attacker who compromised a key that was later rotated away can still use = dns-persist records containing that key's thumbprint. That's the = opposite of what rotation is for. You could bound it (e.g. accept keys from the last N rotations, or = within a time window) but then clients eventually need to update DNS = records anyway, and the CA carries the complexity of deciding which old = keys are recent enough.