Nowadays, recent technological innovations in low-power, low-cost communication miniature computing devices and sensors, make it possible to use them in an increasingly wide range of objects. Furthermore, their communication capabilities make it possible to build Networked Embedded Systems (NES) in which devices collaborate with each other and exhibit autonomous and coordinated behavior. Security, is a crucial requirement for an increasing number of embedded systems, ranging from low-end systems such as PDAs and networked sensors to high-end systems such as routers, gateways and storage...