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Wireless Sensor Network (WSN) consists of a large number of nodes with limited sensing, computation and communication capabilities. In such network consisting of resource constrained nodes, data transmission is a energy-consuming operation. Hence to increase the lifetime of the network it is essential to reduce the number of bits transmitted. One widely used method for reducing the data transmission is data aggregation. The security issues such as data integrity, confidentiality and freshness in data aggregation become crucial when the WSN is deployed in a remote or hostile environment where sensors are prone to node failures and compromises. Secure data aggregation schemes are suitable to achieve security in data aggregation. In this paper we propose a Secure Data Aggregation scheme which provides end-to-end data privacy. The average number of bits transmitted per node is reduced by 30%-50% compared to the scheme in.