SECURE DATA AGGREGATION USING WATERMARKING SCHEME IN WIRELESS SENSOR NETWORKS

Abstract

A wireless sensor network (WSN’s) generates a huge amount of data with limited resource constraints which are susceptible to communication failure and various security attacks due to broadcast nature of communication. We use data aggregation techniques to gather data from different sources to eliminate redundant and duplicate data. There are issues in data aggregation such as delay, redundancy elimination, accuracy, traffic load and security. In this paper, we focus on security issues related to data aggregation techniques: data confidentiality, data integrity, node authentication and aggregator node availability. A sensor node which is providing data to the aggregator node must be an authentic node and aggregator node must be capable of detecting false data from unauthorized nodes in order to avoid flooding of unnecessary data which may lead to denial of service attack. In this paper, a secure data aggregation technique in which synopsis is generated with watermarking by sensing nodes and aggregator node to protect data integrity is proposed. In watermarking, each sensor node embeds a unique watermark to sensor data so that base station can verify the data integrity and combating data modification, data deletion and false data insertion attack.