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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>We shouldn&#8217;t escape characters that are just characters.&nbsp;
Otherwise people will go insane that we&#8217;re wasting bits.&nbsp; In UTF-8,
these characters will use 2 or 3 bytes (unless they&#8217;re overlong).&nbsp;
Escaped, they&#8217;ll use 7 bytes or more per character.&nbsp; There isn&#8217;t
good support for figuring this in Java 1.4.&nbsp; But now that we&#8217;ve
moved past Java 1.4, I think we can use Character.isDefined(), Character.isLetterOrDigit(),
Character.isWhiteSpace(), Character.getType(), etc&#8230; to figure this
out.&nbsp; Anyone want to do a little research and suggest some pseudocode for
this?<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>(we might want to update the password strength algorithm too,
since it should be Unicode safe and isn&#8217;t)<o:p></o:p></span></p>

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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>--Jeff<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

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color:#1F497D'><o:p>&nbsp;</o:p></span></p>

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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:windowtext'>From:</span></b><span style='font-size:10.0pt;font-family:
"Tahoma","sans-serif";color:windowtext'> Jim Manico
[mailto:jim.manico@owasp.org] <br>
<b>Sent:</b> Wednesday, December 09, 2009 3:30 PM<br>
<b>To:</b> 'Ed Schaller'<br>
<b>Cc:</b> Jeff Williams; 'OWASP-ESAPI'; esapi-dev@lists.owasp.org<br>
<b>Subject:</b> Re: [OWASP-ESAPI] Encoding implementation issue...<o:p></o:p></span></p>

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<p class=MsoNormal><o:p>&nbsp;</o:p></p>

<p class=MsoNormal>... and these characters are used rarely, so I feel that
encoding them, anyhow, will have minimal performance impact. I say we go for
it. I'd rather someone complain about performance (Like Knuth said, get it
right first, optimize later), than under-aggressive encoding.<br>
<br>
- Jim<br>
<br>
<br>
<br>
<o:p></o:p></p>

<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><pre>Hang on here...&nbsp; I'm fairly sure that there's no reason to escape characters<o:p></o:p></pre><pre>above 0xFF for XSS purposes. The various parsers and interpreters in the<o:p></o:p></pre><pre>browser don't seem to recognize those characters as anything other than<o:p></o:p></pre><pre>normal text characters - not used for parsing or syntax.<o:p></o:p></pre><pre>&nbsp;&nbsp;&nbsp; <o:p></o:p></pre></blockquote>

<pre><o:p>&nbsp;</o:p></pre><pre>Currently I know of no XSS or other attacks that are using characters<o:p></o:p></pre><pre>above 0xFF. The same could be said about characters above 0x7F or<o:p></o:p></pre><pre>characters not listed on the XSS cheat sheet. The principle however<o:p></o:p></pre><pre>is white listing vs. black listing. Just because we don't know about<o:p></o:p></pre><pre>issues with these characters does not mean that there aren't issues with<o:p></o:p></pre><pre>them. There are 1113856 code points above 0xFF. Additionally, even if<o:p></o:p></pre><pre>these characters aren't normal syntax characters doesn't mean that some<o:p></o:p></pre><pre>poorly implemented parser doesn't mess them up.<o:p></o:p></pre><pre><o:p>&nbsp;</o:p></pre><pre>&nbsp; <o:p></o:p></pre>

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<blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><pre>------&gt;<o:p></o:p></pre><pre>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <o:p></o:p></pre><pre><o:p>&nbsp;</o:p></pre><pre
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</pre><pre><o:p>&nbsp;</o:p></pre><pre>_______________________________________________<o:p></o:p></pre><pre>OWASP-ESAPI mailing list<o:p></o:p></pre><pre><a
href="mailto:OWASP-ESAPI@lists.owasp.org">OWASP-ESAPI@lists.owasp.org</a><o:p></o:p></pre><pre><a
href="https://lists.owasp.org/mailman/listinfo/owasp-esapi">https://lists.owasp.org/mailman/listinfo/owasp-esapi</a><o:p></o:p></pre><pre>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <o:p></o:p></pre></blockquote>

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<br>
<br>
<o:p></o:p></p>

<pre>-- <o:p></o:p></pre><pre><o:p>&nbsp;</o:p></pre><pre>- Jim Manico<o:p></o:p></pre><pre>OWASP ESAPI Project Manager<o:p></o:p></pre><pre><a
href="http://www.owasp.org/index.php/Category:OWASP_Enterprise_Security_API">http://www.owasp.org/index.php/Category:OWASP_Enterprise_Security_API</a><o:p></o:p></pre><pre><o:p>&nbsp;</o:p></pre><pre>OWASP Podcast Host/Producer<o:p></o:p></pre><pre><a
href="http://www.owasp.org/index.php/OWASP_Podcast">http://www.owasp.org/index.php/OWASP_Podcast</a><o:p></o:p></pre></div>

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