Mobile Ad Hoc Networks (MANETs) are composed of a large number of devices that act as dynamic nodes with limited processing\ncapabilities that can share data among each other. Energy efficient security is the major issue in MANETs where data encryption\nand decryption operations should be optimized to consume less energy. In this regard, we have focused on network coding which\nis a lightweight mechanism that can also be used for data confidentiality. In this paper, we have further reduced the cost of network\ncoding mechanism by reducing the size of data used for permutation. The basic idea is that source permutes only global encoding\nvectors (GEVs) without permuting the whole message symbols which significantly reduces the complexity and transmission cost\nover the network.We have also proposed an algorithm for key generation and randompermutation confusion key calculation. The\nproposed scheme achieves better performance in throughput, encryption time, and energy consumption as compared to previous\nschemes.
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