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Wireless Sensor Network (WSN) has been an active research area over the past few years. However, the salient limit is energy. Due to this limitation, it seems important to design a routing protocol for WSN so that sensing data can be transmitted to the receiver securely and efficiently and at the same time energy consumed must be minimum. Hence there is a need to develop a confidentiality scheme for energy efficient Leach protocol (hierarchical clustering protocol) using homomorphic encryption. In homomorphic encryption, data can be aggregated algebrically without decryption and hence less energy consumption.
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