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Wireless Sensor Network (WSN) is a combined group of sensors form a network. WSN will monitor the changes in physical conditions and it will forward the data via multi hop network. Sensors are dynamic in nature so the lifetime of sensors and providing security for the data transmitted by the nodes are the major problems faced by the Wireless Sensor Networks (WSN). Ad hoc On-demand Multipath Distance Vector (AOMDV) routing protocol is used for generating multiple paths between source and destination. Route discovery and route maintenance are main services of AOMDV. By having, Multipath routing protocol increases the lifetime of the sensors by distributing the traffic load among all the paths instead of single path in a network. The malicious node introduces many attacks on WSN because the network is dynamic in nature. The Warm Hole attack is one of the threat in which it will deviates the original path by introducing a tunnel between source and destination. Secure and authentic Multipath Routing Protocol in WSN is a major challenge and should be proposed which overcomes Warm Hole attack and maintain secure data transmission in the network. Elliptic curve cryptosystem (ECC) is used to prevent the attack and improve the performance of a sensor network by sharing secret keys among nodes in the network. By using Hop by Hop authentication scheme, the authentic message will be transmitted between source and destination in the Wireless Sensor Network. Performance evaluation will be done by using measures such as packet delivery ratio, end-to-end delay and throughput.

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