Introduction

Wireless Sensor Networks (WSNs) are getting popular due to the many advantages that they provide for a lot of application domains (military, healthcare, emergency and disaster …). Mainly, WSNs are easy and fast to deploy in hostile environments and will not depend on pre-existing infrastructure (infrastructure-less nature of WSN). These properties considerably reduce the deployment cost of WSNs. Other characteristics make WSN technology attractive but at the same time more vulnerable than traditional wired network technology.

Security for WSN differs from traditional security designed for classical wired network in many points due to new constraints imposed by WSN technology. Therefore new solutions need to be implemented to provide WSN security or existing security solutions need to be adapted (Ng. H.S., Sim. M.L., & Tan. C.M., 2006: Karlof. C., & Wagner. D., 2003).