A sensor network can have variety or diversity, since it can be easily defined or modified to meet users needs. An increasing use of sensor-based medical facilities might lead to increasing dependence on sensor networks and consequently, greater risks. However, traditional security techniques can not successfully provide an adequate answer. The current paper attempted to propose a safer way of keeping security in processing a variety of medical information. Considering the necessity and importance of the security of sensor networks, we can easily expect the field to develop much further.