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+<h1>Security Class</h1>
+
+<p>The Security Class contains methods that help you create a secure application, processing input data for security.</p>
+
+<h2>XSS Filtering</h2>
+
+<p>CodeIgniter comes with a Cross Site Scripting Hack prevention filter which can either run automatically to filter
+all POST and COOKIE data that is encountered, or you can run it on a per item basis.  By default it does <strong>not</strong>
+run globally since it requires a bit of processing overhead, and since you may not need it in all cases.</p>
+
+<p>The XSS filter looks for commonly used techniques to trigger Javascript or other types of code that attempt to hijack cookies
+or do other malicious things.  If anything disallowed is encountered it is rendered safe by converting the data to character entities.</p>
+
+<p>
+Note: This function should only be used to deal with data upon submission. It's not something that should be used for general runtime processing since it requires a fair amount of processing overhead.</p>
+
+
+<p>To filter data through the XSS filter use this function:</p>
+
+<h2>$this->security->xss_clean()</h2>
+
+<p>Here is an usage example:</p>
+
+<code>$data = $this->security->xss_clean($data);</code>
+
+<p>If you want the filter to run automatically every time it encounters POST or COOKIE data you can enable it by opening your
+<kbd>application/config/config.php</kbd> file and setting this:</p>
+
+<code>$config['global_xss_filtering'] = TRUE;</code>
+
+<p>Note: If you use the form validation class, it gives you the option of XSS filtering as well.</p>
+
+<p>An optional second parameter, <dfn>is_image</dfn>, allows this function to be used to test images for potential XSS attacks, useful for file upload security.  When this second parameter is set to <dfn>TRUE</dfn>, instead of returning an altered string, the function returns TRUE if the image is safe, and FALSE if it contained potentially malicious information that a browser may attempt to execute.</p>
+
+<code>if ($this->security->xss_clean($file, TRUE) === FALSE)<br />
+{<br />
+&nbsp;&nbsp;&nbsp;&nbsp;// file failed the XSS test<br />
+}</code>
+
+
+<h2>$this->security->sanitize_filename()</h2>
+
+<p>When accepting filenames from user input, it is best to sanitize them to prevent directory traversal and other security related issues.  To do so, use the <dfn>sanitize_filename()</dfn> method of the Security class.  Here is an example:</p>
+
+<code>$filename = $this->security->sanitize_filename($this->input->post('filename'));</code>
+
+<!-- @todo write docs for CSRF methods -->
+
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