Reviewer: Alexey Melnikov Review result: Ready 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. I reviewed an earlier version of this document and found its Security Considerations to be adequate. Reading the new version I see that they are much improved and discuss various unintentional and malicious modifications in more details. I think the document is better for the new Security Considerations.