public function update(array $data, $where)
 {
     // Serialize
     $data = $this->_serializeColumns($data);
     // Encrypt each column
     foreach ($this->_cryptedColumns as $col) {
         if (!empty($data[$col])) {
             $data[$col] = self::_encrypt($data[$col]);
         }
     }
     return parent::update($data, $where);
 }