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 document is clear and well-written. I believe that the workarounds presented are a bit weak, but I guess the future work will address the issue in a more fundamental manner. From a security considerations point of view, I agree with the authors that the document does not introduce any new security concerns. The summary of the review is: Ready