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In Mobile Ad-hoc NETworks (MANETs), data transmission is speeded up by means of multicasting. Though multicast transmission lessens overhead, collision and congestion, it persuades new challenges towards security management. This challenge must be conquered to bring better throughput of the network. In this paper, the authors introduce a multi level group key management technique for multicast security in MANET. Their technique works in a hierarchical model such that cluster heads are prioritized over cluster members. The secure keys are generated using one-way function chain. In addition to secure key management, the issue of mobility is also handled. By simulation results, they prove the proficiency of their proposed technique. Their secure key management technique incurs low overhead and delay and significantly increases the throughput.
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