Secure data aggregation using irreversible watermarking in WSNs

Wireless sensor networks (WSN) are recently receiving significant attention due to their unlimited potential. In the current years, WSN has been emerged as the technology which combines the best properties of many small and low cost sensors. A wireless sensor network comprises of a large number of nodes that have low-cost, computation, limited sensing, and communication capabilities. Data aggregation is the process of summarizing and combining sensor data so that the amount of data transmitted in the network is reduced. In a large sensor network, in-network data aggregation significantly reduces the amount of communication and energy consumption. In this paper, we are transforming result formed the watermark, which was embedded into the sending data. The receiving node judges the authenticity of the data by verifying this watermark. Once the watermark has been detected, the receiving node embeds its own watermark on data and transmitted to the sink. Otherwise the data would be discarded. So the only authenticated data send to the base station. Our proposed method maintains hop-by-hop authentication and integrity of data. The proposed scheme incorporates multilevel authentication of the original data. At each level constrained aggregation is done. Number of child per aggregator is limited to three nodes to reduce the computational overhead per aggregator.