public function login(){
            if($this->request->isPost()){
                try{
                    $session = new Zeit_Session('tempLogin');
                    $phrase = $this->request->getPost('phrase');

                    if(strlen($phrase) > 0 && strlen($session->captcha) > 0 && $phrase == $session->captcha){
                        $session->destroy('captcha');
                    }else{
                        throw new Zeit_Controller_Exception('Por favor intente otra vez');
                    }

                    unlink(md5(session_id()) . '.png');

                    $this->destroySession();

                    $idType = $this->request->getPost('tipoIdentificacion');
                    $idNumber = $this->request->getPost('identificacion');
                    $password = $this->request->getPost('contrasena');

                    if($idNumber == ''){
                        throw new Zeit_Controller_Exception('Por favor escriba su numero de identificacion');
                    }

                    $this->logger->info('Verificando si el usuario se encuentra en el sistema...');
                    $this->logger->debug('Tipo de identificacion [ ' . $idType . ' ] - Numero de identificacion [ ' . $idNumber . ' ]');

                    $userMapper = new Entity_UsuarioMapper();
                    $user = $userMapper->findByTypeAndNumberIdentification($idType, $idNumber);

                    if(!($user instanceof Entity_Usuario)){
                        throw new Zeit_Controller_Exception('El usuario no se encuentra en el sistema');
                    }

                    if(md5($password) != $user->getContrasena()){
                        throw new Zeit_Controller_Exception('La contraseña es invalida');
                    }

                    $this->logger->info('El usuario si se encontro en el sistema');

                    $session = new Zeit_Session('tempLogin');
                    $session->loggedUser = $user;

                    return 'success';
                }catch(Zeit_Entity_Exception $e){
                    $this->logger->debug($e);
                    $this->logger->error('Error al ingresar al sistema');
                    switch($e->getCode()){
                        case 1: $loginForm['error'] = 'no_db_connection'; break;
                        case 2: $loginForm['error'] = 'fill_email_and_password'; break;
                        case 3: $loginForm['error'] = 'invalid_credentials'; break;
                        default: $loginForm['error'] = 'service_unavailable'; break;
                    }
                }catch(Zeit_Controller_Exception $e){
                    $this->response->addVar('loginForm', $e->getMessage());
                }
            }

            //Set CAPTCHA options
            $imageOptions = array(
                'font_size' => 24,
                'font_path' => './',
                //'font_file' => 'Acquaintance.ttf',
                'font_file' => 'A.C.M.E. Secret Agent Italic.ttf',
                'text_color' => '#DDFF99',
                'lines_color' => '#CCEEDD',
                'background_color' => '#555555'
            );

            //Set CAPTCHA options
            $options = array(
                'width' => 200,
                'height' => 80,
                'output' => 'png',
                'imageOptions' => $imageOptions
            );

            //Generate a new Text_CAPTCHA object, Image driver
            $c = Text_CAPTCHA::factory('Image');
            $retval = $c->init($options);
            if(PEAR::isError($retval)){
                printf('Error initializing CAPTCHA: %s!', $retval->getMessage());
                exit;
            }

            //Get CAPTCHA secret passphrase
            $session = new Zeit_Session('tempLogin');
            $session->captcha = $c->getPhrase();
            //$_SESSION['phrase'] = $c->getPhrase();

            //Get CAPTCHA image (as PNG)
            $png = $c->getCAPTCHAAsPNG();
            if(PEAR::isError($png)){
                echo 'Error generating CAPTCHA!';
                echo $png->getMessage();
                exit;
            }
            file_put_contents(md5(session_id()) . '.png', $png);

            $this->response->addVar('time', time());
            $this->response->addVar('image', md5(session_id()));

            return 'form';
        }