Stringprep Revision Problem Statement

Document Type Replaced Internet-Draft (individual)
Author Marc Blanchet 
Last updated 2010-10-27 (latest revision 2010-07-05)
Replaced by RFC 6885, RFC 6885
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IESG IESG state Replaced by draft-ietf-precis-problem-statement, draft-ietf-precis-problem-statement
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


Using Unicode codepoints in protocol strings requires preparation of the string. Internationalized Domain Names(idn) initial work defined and used Stringprep and Nameprep. Other protocols have defined Stringprep profiles. A new approach different from Stringprep/ Nameprep is used for a revision of IDN. The Stringprep profiles need to be updated or a replacement of Stringprep need to be designed. This document summarizes the findings of the current usage of Stringprep and identifies directions for a new Stringprep replacement protocol.


Marc Blanchet (

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