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. This document registers Hypertext Transfer Protocol (HTTP) authentication schemes which have been defined in standards=tract RCFs before the IANA HTTP Authentication Scheme Registry was established. My understanding is that registration does not constitute an endorsement of security; it simply allows IANA do make sure that any identifiers, etc. specified remain unique.  Thus I do not see any security issues with this document. Catherine Meadows Naval Research Laboratory Code 5543 4555 Overlook Ave., S.W. Washington DC, 20375 phone: 202-767-3490 fax: 202-404-7942 email:  catherine.meadows at nrl.navy.mil