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Eficient schemes for key predistribution and shared-key discovery play a vital role in security and eficiency of pairwise key establishment an sensor networks. In this paper, we propose a scheme for key predistribution using hash-chain and subsequent shared-key discove y. We show potential active attacks on sensor networks due to key predistribution which can have severer consequences as compared to attucks described in existing proposals. We also show that as compared to the existing schemes, our scheme is more resilient to these active attacks.

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