@techreport{biggs-acme-sso-01,
    number =    {draft-biggs-acme-sso-01},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-biggs-acme-sso/01/},
    author =    {Andrew Biggs and Richard Barnes and Moynihan},
    title =     {{Automated Certificate Management Environment (ACME) Extension for Single Sign On Challenges}},
    pagetotal = 14,
    year =      2021,
    month =     apr,
    day =       8,
    abstract =  {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.},
}