International Journal of Engineering and Technology

Data aggregation is a key challenging task in wireless senor network to reduce energy consumption and ensures the data reliability and security. Multi-level data aggregation techniques ensure security and reliability of data aggregation in the presence of secure routing. Every movement of data must be followed by secure routing via the dynamically distributed secure node list to ensure the secure path. Three different levels of aggregation are used to add for more security and so it reduces the time consumption of the network. In the first level, the sensors senses its own signal or it may receive from adjacent sensors and checks the duplication then forward it to the nearest storage node in its region, where the storage nodes are special than the ordinary sensor nodes due to additional computation with high resource capacity. In the second level, the storage node receives from sensors and it senses itself and checks the duplication and also it tries to avoid the very closer data to be transmitted. In the Final level, the base station receives the data from the storage nodes and generates the whole data set for its own region based on session ID. The session and region based data sets are used for data aggregation and to store the sensed data. The session based secure keys are used to protect the data and it is controlled by distributed data server. Due to very sensitive data transmission, two different encryptions are applied in high level data aggregation and shield the data for each and every level by using the digital signature to add more security on data.