Abstract: A Wireless Sensor Network consists of spatially distributed sensor nodes. In a WSN, each sensor node is able to independently perform some processing and sensing tasks. Furthermore, sensor nodes communicate with each other in order to forward their sensed information to a base station. Wireless sensor networks have limited computational power and limited memory and battery power, this leads to increased complexity for application developers and often results in applications that are closely coupled with network protocols. In Data aggregation the sensor nodes can monitor the environment by collecting information from their surroundings, and work cooperatively to send the data to a base station, or sink, for analysis. Homomorphic encryptions have been applied only in Homogeneous environment not for heterogeneous environment. The existing schemes become insecure in case some sensor nodes are compromised. Existing schemes may suffer unauthorized aggregation attacks. The above problems are solved using Masked secure data aggregation scheme.

Keywords: Sensor nodes, Base station, Homomorphic encryptions, masked secure data aggregation.