I have reviewed this document as part of the security directorate's ongoing effort to review all IETF documents being processed by the IESG.  These comments were written primarily for the benefit of the security area directors.  Document editors and WG chairs should treat these comments just like any other last call comments. Summary: Ready This is an Informational draft that describes some high-level requirements, and describes a variant of a scheme defined in a separate Standards Track document. As such, the Security Considerations section, that states that the document does not introduce any new security issues, seems appropriate to me. Regards,  Rifaat