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Key management in wireless sensor network is a challenging task because public key cryptosystem are unsuitable for using in resource constrained sensor nodes, and the nodes could be physically compromised by a rival. Due to resource constraints, it is infeasible to apply traditional key management techniques in WSN. Numerous dynamic key management schemes have been proposed so far, for maintaining secure channels among communicating nodes but they all are not efficient in terms of resource constraints parameters. This paper proposes a dynamic key management scheme by combining the advantages of simple cryptography and random key pre-distribution scheme.
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