protected function _encrypt($decrypted = []) {
		$vector = $this->_config['vector'];
		$secret = $this->_hashSecret($this->_config['secret']);

		mcrypt_generic_init(static::$_resource, $secret, $vector);
		$encrypted = mcrypt_generic(static::$_resource, serialize($decrypted));
		mcrypt_generic_deinit(static::$_resource);

		return base64_encode($encrypted) . base64_encode($vector);
	}