Date Added: Jun 2009
In recent years, the applications of ubiquitous sensors have become very important in the real world. However, it is dangerous if security crackers can access to the sensor nodes or micro servers because they can attack them. Therefore, the minimum security is needed in the ubiquitous sensor networks. Researchers have focused on creating a small system composed of sensors and a micro server where it has a small sized memory, multifunction, low cost, but without security consideration. The security problem in the micro server is a challenging task because of the very limited flash memory. IPSec is their target where the authors can implement it for tiny microcontrollers.