Re: IDN Security, recommended character ranges blacklist

From: Doug Ewell (
Date: Tue Feb 15 2005 - 23:41:12 CST

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    Neil Harris <neil at tonal dot clara dot co dot uk> wrote:

    > Okay, let's get rid of those two ranges, and only blacklist:
    > ...
    > * High Surrogates
    > * Low Surrogates

    This is at once unnecessary and excessive. Unpaired surrogates are not
    even valid Unicode, and are specifically prohibited in nameprep; while
    paired surrogates may represent a perfectly legitimate IDN character
    (from CJK Extension B, for instance).

    -Doug Ewell
     Fullerton, California

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