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. The previous concerns I have had with a prior revision of this document seem to have been resolved adequately. There appear to be no security concerns introduced by revisions since my last review.