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diff --git a/inc/classes/main/filter/crypto/class_CaptchaEncryptFilter.php b/inc/classes/main/filter/crypto/class_CaptchaEncryptFilter.php
new file mode 100644
index 0000000000..b399a8917c
--- /dev/null
+++ b/inc/classes/main/filter/crypto/class_CaptchaEncryptFilter.php
@@ -0,0 +1,90 @@
+<?php
+/**
+ * A filter for checking if the "encrypt" value is set and fine
+ *
+ * @author		Roland Haeder <webmaster@ship-simu.org>
+ * @version		0.0.0
+ * @copyright	Copyright (c) 2007, 2008 Roland Haeder, this is free software
+ * @license		GNU GPL 3.0 or any newer version
+ * @link		http://www.ship-simu.org
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+class CaptchaEncryptFilter extends BaseFrameworkSystem implements Filterable {
+	/**
+	 * Protected constructor
+	 *
+	 * @return	void
+	 */
+	protected function __construct () {
+		// Call parent constructor
+		parent::__construct(__CLASS__);
+	}
+
+	/**
+	 * Creates an instance of this filter class
+	 *
+	 * @return	$filterInstance		An instance of this filter class
+	 */
+	public final static function createCaptchaEncryptFilter () {
+		// Get a new instance
+		$filterInstance = new CaptchaEncryptFilter();
+
+		// Return the instance
+		return $filterInstance;
+	}
+
+	/**
+	 * Executes the filter with given request and response objects
+	 *
+	 * @param	$requestInstance	An instance of a class with an Requestable interface
+	 * @param	$responseInstance	An instance of a class with an Responseable interface
+	 * @return	void
+	 * @throws	EncryptMissingException		If the "encrypt" value is not set
+	 */
+	public function execute (Requestable $requestInstance, Responseable $responseInstance) {
+		// Get "encrypt" string barely from the request
+		$encryptRequest = $requestInstance->getRequestElement('encrypt');
+
+		// Is it there?
+		if (is_null($encryptRequest)) {
+			// Not found, so request is invalid
+			$requestInstance->requestIsValid(false);
+
+			// Throw exception
+			throw new EncryptMissingException($this, CryptoHelper::EXCEPTION_ENCRYPT_MISSING);
+		} // END - if
+
+		// Decode it fully
+		$encryptDecoded = base64_decode(str_replace(" ", "+", urldecode($encryptRequest)));
+
+		// Get a crypto helper and decrypt the string
+		$decryptedString = ObjectFactory::createObjectByConfiguredName('crypto_class')->decryptString($encryptDecoded);
+
+		// Is it the expected length?
+		if (strlen($decryptedString) != $this->getConfigInstance()->readConfig('captcha_string_length')) {
+			// Not found, so request is invalid
+			$requestInstance->requestIsValid(false);
+
+			// Throw exception
+			throw new EncryptInvalidLengthException($this, CryptoHelper::EXCEPTION_ENCRYPT_INVALID);
+		} // END - if
+
+		// Write it to the request
+		$requestInstance->setRequestElement('decrypted', $decryptedString);
+	}
+}
+
+// [EOF]
+?>