diff --git a/system/libraries/Validation.php b/system/libraries/Validation.php
index 162d362..7720a7d 100644
--- a/system/libraries/Validation.php
+++ b/system/libraries/Validation.php
@@ -573,6 +573,23 @@
 	// --------------------------------------------------------------------
 	
 	/**
+	 * Valid Base64
+	 *
+	 * Tests a string for characters outside of the Base64 alphabet
+	 * as defined by RFC 2045 http://www.faqs.org/rfcs/rfc2045
+	 *
+	 * @access	public
+	 * @param	string
+	 * @return	bool
+	 */
+	function valid_base64($str)
+	{
+		return (bool) ! preg_match('/[^a-zA-Z0-9\/\+=]/', $str);
+	}
+
+	// --------------------------------------------------------------------
+	
+	/**
 	 * Set Select
 	 *
 	 * Enables pull-down lists to be set to the value the user