Secure communication in Wireless Sensor Networks using AES algorithm with delay efficient sleep scheduling

Wireless Sensor Networks (WSN) become an emerging technology due to its low cost solution to the real world challenges. With the widespread growth in applications for resource-limited Wireless Sensor Networks, the need for reliable and efficient security mechanisms for them has increased in manifold but its implementation is a non-trivial task. In mission critical applications we need both security and minimized transmission delay. In this paper we have analyzed Encryption algorithm like AES (Advanced Encryption Standard) to provide sufficient levels of security for protecting the confidentiality of the data in the WSN network. To prolong the network lifetime, some sleep scheduling methods are always employed in WSNs, resulting in significant broadcasting delay, especially in large scale WSNs. Here we explores a novel sleep scheduling method to reduce the delay of alarm broadcasting from any sensor node in WSNs. Specifically, here we have two determined traffic paths for the transmission of alarm message, and level-by-level offset based wake-up pattern according to the paths, respectively. When a critical event occurs, an alarm is quickly transmitted along one of the traffic paths to a center node, and then it is immediately broadcast by the center node along another path without collision.