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Security, Stability & Resiliency of the DNS Review Team (SSR RT) - Draft Report

Comment/Reply Periods (*) Important Information Links
Comment Open: 15 March 2012
Comment Close: 8 April 2012 Extended to 15 April 2012
Close Time (UTC): 23.59 UTC Public Comment Announcement
Reply Open: 16 April 2012 To Submit Your Comments (Forum Closed)
Reply Close: 7 May 2012 Extended to 14 May 2012 View Comments Submitted
Close Time (UTC): 23.59 UTC Report of Public Comments
Brief Overview
Originating Organization: Security, Stability & Resiliency of the DNS Review Team (SSR RT)


Purpose (Brief): The SSR Review Team is publishing its Draft Report and Recommendations for public comment to inform the Review Team’s work in producing a Final Report.
Current Status:

Draft Report for public comment

Next Steps:

Final Report and Recommendations to be developed, submitted to the ICANN Board, and posted for public comment.

Staff Contact: Olof Nordling Email:
Detailed Information
Section I: Description, Explanation, and Purpose

The Security, Stability & Resiliency of the DNS Review Team (SSR RT), constituted under the Affirmation of Commitments (AoC), publishes its Draft Report and Recommendations for public comment to inform their work in producing a Final Report.

Section II: Background

The Security, Stability and Resiliency of the DNS (SSR RT) commenced its activities in October 2010 and finalized its Terms of Reference in June 2011 at the ICANN Singapore meeting. This document represents the results of an 18 month period of research, analysis, interviews and consultation with the community. The SSR Review Team solicited the ICANN Community’s feedback on a set of issues [PDF, 13 KB] through a public comment period, as well as during the ICANN 40 meeting in San Francisco.

Section III: Document and Resource Links

The full SSR Review Team Draft Report and Recommendations, which begins with an Executive Summary and an overview of the Team’s recommendations:

Section IV: Additional Information

Translations of the Draft Report and Recommendations are available. The Review Team also will present its Draft Report and Recommendations in an upcoming Webinar. Please refer to the SSR Review Team's public wiki for more information:

The deadline to submit public comments is extended to 15 April 2012. The SSR Review Team welcomes submissions of comments and input during the reply comment period. Please feel free to submit any feedback you may have by 14 May 2012.

(*) Comments submitted after the posted Close Date/Time are not guaranteed to be considered in any final summary, analysis, reporting, or decision-making that takes place once this period lapses.

Domain Name System
Internationalized Domain Name ,IDN,"IDNs are domain names that include characters used in the local representation of languages that are not written with the twenty-six letters of the basic Latin alphabet ""a-z"". An IDN can contain Latin letters with diacritical marks, as required by many European languages, or may consist of characters from non-Latin scripts such as Arabic or Chinese. Many languages also use other types of digits than the European ""0-9"". The basic Latin alphabet together with the European-Arabic digits are, for the purpose of domain names, termed ""ASCII characters"" (ASCII = American Standard Code for Information Interchange). These are also included in the broader range of ""Unicode characters"" that provides the basis for IDNs. The ""hostname rule"" requires that all domain names of the type under consideration here are stored in the DNS using only the ASCII characters listed above, with the one further addition of the hyphen ""-"". The Unicode form of an IDN therefore requires special encoding before it is entered into the DNS. The following terminology is used when distinguishing between these forms: A domain name consists of a series of ""labels"" (separated by ""dots""). The ASCII form of an IDN label is termed an ""A-label"". All operations defined in the DNS protocol use A-labels exclusively. The Unicode form, which a user expects to be displayed, is termed a ""U-label"". The difference may be illustrated with the Hindi word for ""test"" — परीका — appearing here as a U-label would (in the Devanagari script). A special form of ""ASCII compatible encoding"" (abbreviated ACE) is applied to this to produce the corresponding A-label: xn--11b5bs1di. A domain name that only includes ASCII letters, digits, and hyphens is termed an ""LDH label"". Although the definitions of A-labels and LDH-labels overlap, a name consisting exclusively of LDH labels, such as"""" is not an IDN."