http://www.rfc-editor.org/rfc/rfc6717.txt
RFC 6717: kx509 Kerberized Certificate Issuance Protocol in Use in 2012, H. Hotz, R. Allbery2012-08-01T23:00:00-00:00While not standardized, this protocol is already in use at several large organizations, and certificates issued with this protocol are recognized by the International Grid Trust Federation. This document is not an Internet Standards Track specification; it is published for informational purposes.