ABSTRACT
This chapter presents a survey of security issues in Wireless sensor networks (WSNs). It outlines the constraints, security requirements, and attacks with corresponding countermeasures in WSNs, and presents a holistic view of security issues. WSNs are used in many applications in military, ecological, and health-related areas. Advances in wireless communication and electronics have enabled the development of low-cost, low-power, multi-functional sensor nodes. A sensor consists of four basic parts: a sensing unit, a processing unit, a transceiver unit, and a power unit. The communication range of sensor nodes is limited both technically and by the need to conserve energy. Many routing protocols have been specifically designed for WSNs. These routing protocols can be divided into three categories according to the network structure: flat-based routing, hierarchical-based routing, and location-based routing. One of the fundamental security services in sensor networks is broadcast authentication.
