Data validation and integrity verification for trust based data aggregation protocol in WSN

Abstract

In Wireless Sensor Networks, during data fragmentation, there are chances for dropping some blocks and injecting forged data by the attackers. So the integrity of these fragmented blocks and correctness of data, need to be verified. Also, DoS attacks needs to be prevented. In order to consider the above points, we proposed a design trust based data aggregation protocol using data validation and integrity verification in WSN. In this protocol, aggregation tree is formed by using the trust value which is evaluated for each node based on the trust features and the sensed data is encrypted with the shared symmetric key. Then the encrypted data are fragmented and signed with homomorphic MAC tag. Once the signed blocks are received, the aggregator performs SUM aggregation function after checking the correctness of data and verifying integrity of each block. The aggregated result is then transmitted to the sink, where it is again verified by the sink. This process is repeated by each sensor for the sensed results. By comparing the values obtained by simulation, we exhibit that the presented technique improves the data correctness.