Abstract
Wireless sensor network (WSN) consists of resource constraint sensor nodes where nodes (sensors) send data to the base station/sink node and communicate with each other by either forming a cluster or without forming a cluster. Data aggregation in WSN takes place at the responsible nodes (aggregators) in a cluster before sending data to the base station, based on the query that is received from the base station. Thus data aggregation reduces energy consumption of the nodes due to minimized communication. As a result, the life time of the individual sensors prolong in the case of aggregation compared to the data transmission that occurs without performing aggregation. One of the major security challenges for data aggregation in WSN is that the aggregators expose clear data at the aggregation level. Therefore, this aggregation level is vulnerable to attacks by intruders. Existing research has addressed this problem and proposed solutions by considering static node topology of WSN. However, in WSN the nodes can either be static or dynamic. Therefore, the existing approaches do not tackle the security issues that arise in dynamic node WSN. The proposed research aims to explore this problem and propose solutions based on a cryptographic approach.