Data Aggregation is an effective technique in Wireless Sensor Network (WSN) because it reduces the number of packets to be sent to sink and increases the lifetime of sensor network by aggregating the similar packets. This technique uses cluster method and clustering has been shown to improve network lifetime, reduce network traffic and the contention for the channel. There are certain drawbacks in the cluster method. The master node is a single point of failure and if a master node fails then

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... e entire sub network fails. To make a WSN successfully operate mater failures or malicious attacks are to be avoided. This paper investigates disparities between mathematical security and practical security in wireless sensor networks. This paper proposes a key exchange management scheme that enables two users for exchanging a key securely and that key can be used for sequent encryption of messages. A Sande-Tukey Algorithm is developed for splitting sensor nodes to provide the key. Especially this technique is used to aggregate the total computation outputs and to identify the total number of failures within the environment.