Date Added: Feb 2013
Wireless Sensor Networks (WSN) is deployed in sensitive and unattended areas that cannot be reached by human beings. Therefore, it is difficult to maintain them. In addition, sensors are of limited memory, processing power and energy by nature. By consequence, this makes WSN subject to attacks such as network failure, data acquisition and modification, etc. Many security solutions are exposed in the literature to overcome this problem. Secure data aggregation, encryption and authentication, and key management are developed to maintain the security of the WSN.