Smart vehicles tend to choose an over-the-air (OTA) software (SW) update service. In an environment with smart vehicles, software malfunctions may have serious consequences such as accidents involving human lives and property loss. Therefore, we must ensure that the software updates in smart vehicles are completed correctly. In this study, we focused on the assurance of both data integrity and service integrity in smart vehicles to improve the OTA SW update service security. To this end, the security features of integrity in smart vehicles were identified and discussed with an emphasis on its potential impact on future vehicular applications.