On Wed, May 31, 2023 at 11:05:14PM -0400, Robert Moskowitz wrote: > So here there is a real risk of serial number duplication, but the > subjectKey will be different. That is what I am pinning uniqueness on. If you intend to be able to publish CRLs, then the serial numbers must be unique. https://datatracker.ietf.org/doc/html/rfc5280#section-5.1.2.6 CRLs list just the serial numbers of revoked certificates. -- Viktor.