Source Code for http://authors.aspalliance.com/brettb/ROT13EncodingWithASP.asp
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<h2 align="left">Encoding and decoding strings using the ROT13 method</h2>
<p align="left">ROT13 is a commonly used method for encoding a text string so that it
cannot be easily read. This encoding process DOES NOT encrypt the text (so don't even
consider using it to encode passwords or other sensitive information). Nonetheless, it is
a useful method to use in certain situations. If you want to use sophisticated
encryption within ASP, then take a look at <a
href="http://www.4guysfromrolla.com/webtech/110599-1.shtml">this article</a>.</p>
<p align="left">ROT13 uses a simple encoding process; the alphabet is rotated 13
characters, so that "a" becomes "n", "z" becomes
"m", "N" becomes "Y" and so on...</p>
<div align="right">
<table border="2" cellpadding="2" cellspacing="0" width="120" bordercolor="#000000"
align="right">
<tr>
<td bgcolor="#000000"><img src="images/warning.gif" width="25" height="23" alt="Warning!"
align="absmiddle"></td>
<td bgcolor="#000000"><font face="Arial" color="#FFFFFF"><p align="right"></font><strong><font
color="#FFFFFF">Warning!</font></strong></td>
</tr>
<tr>
<td colspan="2">ROT13 is a simple encoding process, so it is not suitable for encrypting
sensitive information.</td>
</tr>
</table>
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<p align="left">ROT13 originated on USENET, so if you have added USENET support to your
ASP powered website then it is a particularly useful feature to build into the site.</p>
<p align="left">Another possible use would be to encode Query Strings or non-sensitive
cookie data. Although it must be stressed that ROT13 does not encrypt text, it can be
effective in keeping the average user from figuring out how your site works. So if you
used ROT13 in your site, instead of something like...<br>
<br>
<b>http://www.foo.com/login.asp?user=freddy&dept=customer%20support</b><br>
<br>
the Query String would become:<br>
<br>
<b>http://www.foo.com/login.asp?user=serqql&dept=phfgbzre%20fhccbeg</b></p>
<p align="left">If you want to test ROT13 encoding, then enter some text into the box
below:</p>
<form method="POST" action="ROT13EncodingWithASP.asp" name="ROT13_form">
<div align="center"><center><p><textarea rows="7" name="ROT13" cols="37" wrap="physical">Hello World!</textarea></p>
</center></div><div align="center"><center><p><input type="submit"
value="Encode/Decode ROT13" name="B1"></p>
</center></div>
</form>
<p align="left">Encoding and decoding of ROT13 can be easily carried out by an ASP script
or a JavaScript. The script (written in VBScript, PHP, JScript and client side JavaScript)
is shown below.</p>
<h3 align="left">VBScript</h3>
<p align="left">The VBScript function for encoding and decoding text using ROT13 is shown
below:</p>
<p align="left"><font face="verdana,arial,geneva" size="1" color="#008000">' rot13
function - a function to encode and decode text strings using the popular ROT13 method<br>
' note that ROT13 does not encrypt strings, so do not use it if security is an issue!</font><font
face="verdana,arial,geneva" size="1" color="#808080"><br>
Function rot13(rot13text)<br>
rot13text_rotated = "" </font><font
face="verdana,arial,geneva" size="1" color="#008000">' the function will return this
string</font><font face="verdana,arial,geneva" size="1" color="#808080"><br>
For i = 1 to Len(rot13text)<br>
j = Mid(rot13text, i, 1) </font><font
face="verdana,arial,geneva" size="1" color="#008000">' take the next character in the
string</font><font face="verdana,arial,geneva" size="1" color="#808080"><br>
k = Asc(j) </font><font face="verdana,arial,geneva"
size="1" color="#008000">' find out the character code</font><font
face="verdana,arial,geneva" size="1" color="#808080"><br>
if k >= 97 and k =< 109 then<br>
k = k + 13 </font><font
face="verdana,arial,geneva" size="1" color="#008000">' a ... m inclusive become n ... z</font><font
face="verdana,arial,geneva" size="1" color="#808080"><br>
elseif k >= 110 and k =< 122 then<br>
k = k - 13 </font><font
face="verdana,arial,geneva" size="1" color="#008000">' n ... z inclusive become a ... m</font><font
face="verdana,arial,geneva" size="1" color="#808080"><br>
elseif k >= 65 and k =< 77 then<br>
k = k + 13 </font><font
face="verdana,arial,geneva" size="1" color="#008000">' A ... M inclusive become N ... Z</font><font
face="verdana,arial,geneva" size="1" color="#808080"><br>
elseif k >= 78 and k =< 90 then<br>
k = k - 13 </font><font
face="verdana,arial,geneva" size="1" color="#008000">' N ... Z inclusive become A ... M</font><font
face="verdana,arial,geneva" size="1" color="#808080"><br>
end if<br>
<br>
</font><font face="verdana,arial,geneva" size="1" color="#008000">'add the current
character to the string returned by the function</font><font face="verdana,arial,geneva"
size="1" color="#808080"><br>
rot13text_rotated = rot13text_rotated & Chr(k)<br>
<br>
Next<br>
<br>
rot13 = rot13text_rotated<br>
<br>
End Function</font></p>
<p align="left">The function can then be called from an ASP page by using something like:</p>
<p align="left"><font color="#808080">Response.Write rot13("Hello World")</font></p>
<p align="left">or</p>
<p align="left"><font color="#808080"><%=rot13(my_department)%></font></p>
<p align="left">Don't forget that the same function is used to both encode and decode
ROT13.</p>
<h3 align="left">JavaScript</h3>
<p align="left">It is also possible to use ROT13 encoding with JavaScript. The function
below uses JavaScript to convert strings using the ROT13 method. It has been tested and
found to work in Internet Explorer 5 and Netscape 4.5.</p>
<p align="left"><font color="#808080"><script LANGUAGE="JavaScript"><br>
function JSrot13(text) {<br>
var rot13text_rotated = ""; </font><font color="#008000">/* the function will
return this string */</font><font color="#808080">;<br>
<br>
for (i = 1 ; i < (text.length + 1); i++) {<br>
<br>
k = text.charCodeAt(i-1);<br>
<br>
if (k >= 97 && k <= 109) {<br>
k = k + 13;<br>
} else<br>
<br>
if (k >= 110 && k <= 122) {<br>
k = k - 13;<br>
} else<br>
<br>
if (k >= 65 && k <= 77) {<br>
k = k + 13;<br>
} else<br>
<br>
if (k >= 78 && k <= 90) {<br>
k = k - 13;<br>
}<br>
<br>
rot13text_rotated = rot13text_rotated + String.fromCharCode(k);<br>
<br>
}<br>
<br>
return rot13text_rotated;<br>
}<br>
</script><br>
</font><br>
Once you have added the function to the page, it can be called using something like:<br>
<br>
<font color="#808080"><script language="JavaScript"><br>
document.write (JSrot13("Visit ASPAlliance.com for some great original ASP
articles!"));<br>
</script></font></p>
<h3 align="left">ASP.NET (C# and VB.NET)</h3>
<ul>
<li><p align="left">See this article: <a href="ROT13EncodingWithASPNet.asp">ROT13 Encoding
in ASP.NET using C# and VB.NET</a>.</p>
</li>
</ul>
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<h2>Useful Development Tools</h2>
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<tr>
<td width="100%" valign="top"><a
href="http://www.winnershtriangle.com/w/Products.ASPDocumentationTool.asp" target="_blank" title="ASP Documentation Tool™"><strong>ASP
Documentation Tool™</strong></a></td>
</tr>
<tr>
<td width="100%" valign="top">Automatically creates developer documentation for ASP 2.0
and 3.0 web applications written in VBScript and JScript. Documentation for Microsoft
Access, SQL Server 7/2000 databases and Visual Basic 6.0 components associated with the
web application can also be incorporated into the reports. Documentation is created in
HTML, HTML Help and plain text formats.</td>
</tr>
<tr>
<td width="100%" valign="top">
<a
href="http://www.winnershtriangle.com/w/SampleWeb_Documentation/SampleWeb.chm"><img
src="images/Icon_CHM.gif" width="16" height="16" alt="View Sample Output (HTML Help format)"
border="0" align="absmiddle"></a> <a
href="http://www.winnershtriangle.com/w/SampleWeb_Documentation/SampleWeb.chm" title="View Sample Output (HTML Help format)">View Sample
Output</a> (HTML Help format).<br>
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src="images/Icon_HTML.gif" width="16" height="16" alt="View Sample Output (HTML Format)"
align="absmiddle" border="0"></a> <a
href="http://www.winnershtriangle.com/w/SampleWeb_Documentation/Default.htm"
target="_blank" title="View Sample Output (HTML Format)">View Sample Output</a> (HTML Format).<br>
<a
href="http://www.brettb.com/redirector.asp?URL=downloads/ASPDocumentationTool_Evaluation_Version.zip"><img
src="images/Icon_Download.gif" width="18" height="20" alt="Download Trial Version"
border="0" align="absmiddle"></a> <a
href="http://www.brettb.com/redirector.asp?URL=downloads/ASPDocumentationTool_Evaluation_Version.zip" title="Download Trial Version">Download
Trial Version</a> (5.2Mb ZIP file).</td>
</tr>
</table>
<br>
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td width="100%" valign="top"><a
href="http://www.winnershtriangle.com/w/Products.IndexServerCompanion.asp" target="_blank" title="Index Server Companion"><strong>Index Server Companion</strong></a></td>
</tr>
<tr>
<td width="100%" valign="top">
The Index Server Companion is a Windows application that extends the functionality of Microsoft Index Server so that it is able to index content from remote websites and also from ODBC databases. As such it can be used as a low cost alternative to Site Server 3.0 Search.
</td>
</tr>
<tr>
<td width="100%" valign="top">
<a
href="http://www.brettb.com/redirector.asp?URL=downloads/IndexServerCompanionDocumentation.zip"><img
src="images/Icon_CHM.gif" width="16" height="16" alt="View Product Documentation"
border="0" align="absmiddle"></a> <a
href="http://www.brettb.com/redirector.asp?URL=downloads/IndexServerCompanionDocumentation.zip" title="View Product Documentation">View Product
Documentation</a> (119K ZIP file).<br>
<a
href="http://www.winnershtriangle.com/w/Products.IndexServerCompanion.SampleSearch.asp"><img
src="images/Icon_HTML.gif" width="16" height="16" alt="Try Sample Search Facility"
align="absmiddle" border="0"></a> <a
href="http://www.winnershtriangle.com/w/Products.IndexServerCompanion.SampleSearch.asp"
target="_blank" title="View Sample Search Facility">Try Sample Search Facility</a>.<br>
<a
href="http://www.brettb.com/redirector.asp?URL=downloads/IndexServerCompanion_EvaluationVersion.zip"><img
src="images/Icon_Download.gif" width="18" height="20" alt="Download Trial Version"
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</tr>
</table>
<br>
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td width="100%" valign="top"><a
href="http://www.winnershtriangle.com/w/Products.ASPNETDocumentationTool.asp" target="_blank" title="ASP.NET Documentation Tool"><strong>ASP.NET Documentation Tool</strong></a></td>
</tr>
<tr>
<td width="100%" valign="top">Automatically creates developer documentation for ASP.NET web applications written in C# or VB.NET.
Documentation for SQL Server 7/2000 databases and C#/VB.NET components associated with the
web application can also be incorporated into the reports. Documentation is created in
HTML, HTML Help and plain text formats.</td>
</tr>
<tr>
<td width="100%" valign="top">
<a href="http://www.winnershtriangle.com/w/ASP.NETDocToolSamples/SampleWeb.NET/SampleWeb.NET.chm"><img
src="images/Icon_CHM.gif" width="16" height="16" alt="View Sample Output (HTML Help format)"
border="0" align="absmiddle"></a> <a
href="http://www.winnershtriangle.com/w/ASP.NETDocToolSamples/SampleWeb.NET/SampleWeb.NET.chm" title="View Sample Output (HTML Help format)">View Sample
Output</a> (HTML Help format).<br>
<a
href="http://www.winnershtriangle.com/w/ASP.NETDocToolSamples/SampleWeb.NET/Default.htm"><img
src="images/Icon_HTML.gif" width="16" height="16" alt="View Sample Output (HTML Format)"
align="absmiddle" border="0"></a> <a
href="http://www.winnershtriangle.com/w/ASP.NETDocToolSamples/SampleWeb.NET/Default.htm"
target="_blank" title="View Sample Output (HTML Format)">View Sample Output</a> (HTML Format).<br>
<a
href="http://www.brettb.com/redirector.asp?URL=downloads/ASP.NETDocumentationTool_1.0.zip"><img
src="images/Icon_Download.gif" width="18" height="20" alt="Download Trial Version"
border="0" align="absmiddle"></a> <a
href="http://www.brettb.com/redirector.asp?URL=downloads/ASP.NETDocumentationTool_1.0.zip" title="Download Trial Version">Download
Trial Version</a> (727K ZIP file).</td>
</tr>
</table>
<br>
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td width="100%" valign="top"><a
href="http://www.winnershtriangle.com/w/Products.SQLDocumentationTool.asp" target="_blank" title="SQL Documentation Tool"><strong>SQL
Documentation Tool</strong></a></td>
</tr>
<tr>
<td width="100%" valign="top">The SQL Documentation Tool creates technical documentation for Microsoft SQL Server 7.0 and 2000 databases. Technical documentation is created in HTML and HTML Help formats. The HTML Help format documentation is fully searchable and cross referenced. The SQL Documentation Tool documents SQL Server Tables, Views, Stored Procedures, Triggers and Table Relationships.</td>
</tr>
<tr>
<td width="100%" valign="top">
<a
href="http://www.winnershtriangle.com/w/SQLDocumentationTool/Reports/Test_Project/Test_Project.chm"><img
src="images/Icon_CHM.gif" width="16" height="16" alt="View Sample Output (HTML Help format)"
border="0" align="absmiddle"></a> <a
href="http://www.winnershtriangle.com/w/SQLDocumentationTool/Reports/Test_Project/Test_Project.chm" title="View Sample Output (HTML Help format)">View Sample
Output</a> (HTML Help format).<br>
<a
href="http://www.winnershtriangle.com/w/SQLDocumentationTool/Reports/Test_Project/Default.htm"><img
src="images/Icon_HTML.gif" width="16" height="16" alt="View Sample Output (HTML Format)"
align="absmiddle" border="0"></a> <a
href="http://www.winnershtriangle.com/w/SQLDocumentationTool/Reports/Test_Project/Default.htm"
target="_blank" title="View Sample Output (HTML Format)">View Sample Output</a> (HTML Format).<br>
<a
href="http://www.brettb.com/redirector.asp?URL=downloads/SQLDocumentationToolTrial.zip"><img
src="images/Icon_Download.gif" width="18" height="20" alt="Download Trial Version"
border="0" align="absmiddle"></a> <a
href="http://www.brettb.com/redirector.asp?URL=downloads/SQLDocumentationToolTrial.zip" title="Download Trial Version">Download
Trial Version</a> (10.3Mb ZIP file).</td>
</tr>
</table>
<br>
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td width="100%" valign="top"><a
href="http://www.winnershtriangle.com/w/Products.TheWebsiteUtility.asp" target="_blank" title="The Website Utility"><strong>The Website Utility</strong></a></td>
</tr>
<tr>
<td width="100%" valign="top">The Website Utility examines websites for errors and
areas that need to be optimised for search engines by using a built in web crawling engine.
Errors checked for include broken or moved hyperlinks, missing page titles and missing meta tags.
It also generates HTML for use in creating website site maps (table of contents pages - like <a href="TableOfContents.asp" title="Example Table of Contents">this one</a>), and is
able to create both client-side <a href="http://www.winnershtriangle.com/w/Products.TheWebsiteUtility.JavaScriptSearchEngine.asp" title="JavaScript Search Engine">JavaScript Search Engines</a> and server-side <a href="http://www.winnershtriangle.com/w/Products.TheWebsiteUtility.ASPSearchEngine.asp" title="JavaScript Search Engine">ASP Search Engines</a> for a website.</td>
</tr>
<tr>
<td width="100%" valign="top">
<a
href="http://www.winnershtriangle.com/w/TheWebsiteUtility/Reports/ASPAlliance/default.htm"><img
src="images/Icon_HTML.gif" width="16" height="16" alt="View Sample Output (HTML Format)"
align="absmiddle" border="0"></a> <a
href="http://www.winnershtriangle.com/w/TheWebsiteUtility/Reports/ASPAlliance/default.htm"
target="_blank" title="View Sample Output (HTML Format)">View Sample Output</a> (HTML Format).<br>
<a
href="http://www.brettb.com/redirector.asp?URL=downloads/TheWebsiteUtilityTrial.zip"><img
src="images/Icon_Download.gif" width="18" height="20" alt="Download Trial Version"
border="0" align="absmiddle"></a> <a
href="http://www.brettb.com/redirector.asp?URL=downloads/TheWebsiteUtilityTrial.zip" title="Download Trial Version">Download
Trial Version</a> (3Mb ZIP file).</td>
</tr>
</table>
<br>
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td width="100%" valign="top"><a
href="http://www.regnow.com/softsell/nph-softsell.cgi?item=8452-18&affiliate=44172" target="_blank" title="Text Workbench"><strong>Text Workbench</strong></a></td>
</tr>
<tr>
<td width="100%" valign="top">Text Workbench is a file search and replacement utility for text files and Microsoft Office documents. Make rapid file replacements on multiple files and folders full of files. Advanced replacement options include regular expressions support. It even works on remote file systems via FTP. A Regular Expression Laboratory allows advanced pattern matching and replacement expressions to be built and tested. This great utility will make your everyday development tasks much easier!
</td>
</tr>
<tr>
<td width="100%" valign="top">
<a
href="http://www.regnow.com/trialware/download/Download_TxtWrBSetup.exe?item=8452-18&affiliate=44172"><img
src="images/Icon_Download.gif" width="18" height="20" alt="Download Trial Version of Text Workbench"
border="0" align="absmiddle"></a> <a
href="http://www.regnow.com/trialware/download/Download_TxtWrBSetup.exe?item=8452-18&affiliate=44172" title="Download Trial Version of Text Workbench">Download
Trial Version</a> (3Mb ZIP file; you have the option to either install directly from this link or save the file for later installation).</td>
</tr>
</table>
</div>
<h2>Author details</h2>
<p><p><a href="http://www.brettb.com/" title="View Brett's personal website">Brett Burridge</a>
spent two years working in the <a href="http://www.essex.ac.uk/"
title="University of Essex">University of Essex</a> Computing Service, before moving to <a
href="http://www.intapps.com/" title="The Internet Applications Group">The Internet
Applications Group</a> in the Autumn of 1999, where he developed e-Business applications for a range of
corporate clients and dot-com start ups.</P>
<P>Brett is presently employed as an Internet developer and technical writer
through his own company,
<a href="http://www.winnershtriangle.com/w/Default.asp" title="Winnersh Triangle Web Solutions Limited" target="_blank">Winnersh Triangle Web Solutions Limited</a>.
The company produces a number of
innovative products, including the popular
<a href="http://www.winnershtriangle.com/w/Products.ASPDocumentationTool.asp" target="_blank" title="ASP Documentation Tool™ - creates project documentation for ASP 2.0 and 3.0 websites written in VBScript and JScript, and also SQL Server 2000 databases">ASP Documentation Tool™</a>, the <a href="http://www.winnershtriangle.com/w/Products.IndexServerCompanion.asp" target="_blank" title="Index Server Companion - extends the functionality of Index Server to allow indexing of content from remote websites and ODBC databases">Index Server Companion</a>, the <a href="http://www.winnershtriangle.com/w/Products.ASPNETDocumentationTool.asp" target="_blank" title="ASP.NET Documentation Tool - creates documentation for ASP.NET web applications written in VB.NET and C#">ASP.NET Documentation Tool</a>, the <a href="http://www.winnershtriangle.com/w/Products.SQLServerDocumentationTool.asp" target="_blank" title="SQL Server Documentation Tool - Documents Microsoft SQL Server Databases">SQL Server Documentation Tool</a> and <a href="http://www.winnershtriangle.com/w/Products.TheWebsiteUtility.asp" target="_blank" title="The Website Utility">The Website Utility</a>.
The company is also available for <a href="http://www.winnershtriangle.com/w/Services.Main.asp" target="_blank" title="web application design and development">web application design and development</a> at reasonable rates, primarily using
<a href="http://www.winnershtriangle.com/w/Services.Microsoft.asp" target="_blank" title="Development using Microsoft technologies such as ASP, ASP.NET, Visual Basic, SQL Server">Microsoft technologies</a> (ASP, ASP.NET, Visual Basic, SQL Server) but also using <a href="http://www.winnershtriangle.com/w/Services.OpenSource.asp" target="_blank" title="Open source development using technologies such as PHP, MySQL and Perl">open source</a>
technologies such as PHP, MySQL and Perl. Specialist services include development
of <a href="http://www.winnershtriangle.com/w/Services.IndexServer.asp" target="_blank" title="Development of search solutions using Microsoft's Index Server and Site Server 3.0 Search">search solutions</a> using Microsoft's Index Server and Site Server 3.0 Search.
</P>
<P>
As well as the ASPAlliance, Brett has written articles for <a href="http://www.ariadne.ac.uk/issue33/nt-explorer/" title="Read Brett's most recent article for Ariadne.ac.uk" target="_blank">Ariadne.ac.uk</a>
and <a href="http://www.asptoday.com/content.asp?id=1435" target="_blank" title="Read Brett's first ASPToday article">ASPToday</a>, and has contributed recipes to the <a href="http://www.amazon.com/exec/obidos/ASIN/0672325241/brettbcom" target="_blank" title="ASP.NET Developer's Cookbook">ASP.NET Developer's Cookbook</a>.
<small><a href="Links.asp" style="color: rgb(252,253,253);">links</a></small>
</P>
<p>
Outside web development, Brett is interested in digital photography (here's my <a href="http://www.brettb.com/gallery.asp" target="_blank" title="My digital photo gallery">photo gallery</a>), <a href="http://www.brettb.com/MyTropicalFishtank.asp" target="_blank" title="My Tropical Fish!">tropical fishkeeping</a>
and collecting contemporary works of art by artists such as <a href="http://www.brettb.com/Doug_Hyde_Gallery.asp" title="My Doug Hyde Limited Edition Sculptures and Prints" target="_blank">Doug Hyde</a>.
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<p>Contact Brett by emailing <script language="JavaScript"><!--
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<h2>Article history</h2>
<p>"Encoding and decoding strings using the ROT13 method" originally published
on ASPWatch.com on September 8 1999. Republished on ASPAlliance.com on 29 September 2001.
Last revised 16 May 2003.</p>
<p align="left"><a href="Default.asp" title="Back to the ASP Kitchen">ASP Kitchen</a>: <a
href="ASPWatchArticles.asp" title="Back to the ASPWatch.com articles">ASPWatch.com
articles</a>: ROT13 Encoding Using ASP</p>
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