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Automated Certificate Management Environment (ACME) Extension for Single Sign On Challenges

Document Type Expired Internet-Draft (individual)
Authors Andrew Biggs , Richard Barnes , Moynihan
Last updated 2021-10-10 (Latest revision 2021-04-08)
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Expired & archived
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IESG IESG state Expired
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at:


This document specifies an extension to the ACME protocol [RFC8555] to enable ACME servers to validate a client's control of an email identifier using single sign-on (SSO) technologies. An extension to the CAA [RFC8659] resource record specification is also defined to provide domain owners a means to declare a set of SSO providers that ACME servers may rely upon when employing SSO for identifier validation on their domain.


Andrew Biggs
Richard Barnes

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)