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<title>Custom charset in RainbowCrack</title>
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<h1>Custom charset in RainbowCrack</h1>
<p><font size="2">by Zhu Shuanglei <shuanglei@hotmail.com><br>
http://www.antsight.com/zsl/rainbowcrack/</font></p>
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<h2>1. Introduction</h2>
<p>Begin with version 1.1, custom charset is supported in RainbowCrack. In this
article, we will describe how to generate and use your rainbow tables with customized
charset.</p>
<h2>2. Prepare your charset configuration file</h2>
<p>In binary distribution of RainbowCrack, there is a file with the name
"charset.txt". This is the charset configuration file of RainbowCrack.<br>
Content of the file looks like this:</p>
<table border="0" width="100%" bgcolor="#EBEBEB">
<tr>
<td width="100%"><font face="Courier New">alpha = [ABCDEFGHIJKLMNOPQRSTUVWXYZ]<br>
alpha-numeric = [ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789]<br>
alpha-numeric-symbol14 = [ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#$%^&*()-_+=]<br>
all = [ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#$%^&*()-_+=~`[]{}|\:;"'<>,.?/]</font></td>
</tr>
</table>
<p>Each line contains a charset definition. To the left of character
"=" is the charset name while the charset content in the right.
Charset content is quoted by "[" and "]" in case space may
appear in the charset content.<br>
For example, we want a charset definition of alpha and space. Just add a line to
the configuration file:</p>
<table border="0" width="100%" bgcolor="#EBEBEB">
<tr>
<td width="100%"><font face="Courier New">alpha-space =
[ABCDEFGHIJKLMNOPQRSTUVWXYZ ]</font></td>
</tr>
</table>
<p>Note: Don't use charset other than alpha, number and "-" in charset
name. Because we store the charset name in the filename of generated rainbow
table, this convention properly avoid the "invalid filename"
situation.</p>
<p>File "charset.txt" in binary distribution is ready to
work. In most situations you needn't modify it, unless you need a custom
charset.</p>
<p>Earlier versions of RainbowCrack (version 1.0 and 1.01) support charset
"alpha" and "alpha-numeric" only. They don't use a charset
configuration file. Charset definitions are hard coded in the programs.</p>
<h2>3. Use charset configuration file</h2>
<p>Configuration file "charset.txt" is used by rtgen.exe and
rcrack.exe.</p>
<p>You can specify the required charset name in the command parameter of
rtgen.exe. For example:</p>
<table border="0" width="100%" bgcolor="#EBEBEB">
<tr>
<td width="100%">rtgen alpha-space 0 100 16 bla</td>
</tr>
</table>
<p>This will generate a rainbow table named "lm_alpha-space_0_100x16_bla.rt"
with charset "<font face="Courier New">ABCDEFGHIJKLMNOPQRSTUVWXYZ </font>",
which is specified in charset.txt.</p>
<p>Program rcrack.exe will parse the file title for the charset name, search the
charset content in the configuration file and use the corresponding charset to
decode the rainbow table.</p>
<p>Note: When a rainbow table of a certain charset name is generated, don't
modify the corresponding entry in configuration file. Without the help of
charset definition in configuration file, the generated rainbow table will
become garbage.</p>
<p>2003-9-18</p>
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