The growth in the development of wireless sensor networks and their applications in many areas demand an efficient security system. But providing security in wireless sensors network is not upfront compared to the other wireless networks due to the resource constraints of the sensor nodes. The symmetric key cryptography is a suitable mechanism to provide security when considering the resource constraints of the sensor nodes. The effectiveness of the security mechanism depends purely on the underlying key management technique, especially, how efficiently the keys are distributed to the sensor nodes. Here, the authors propose a key pre-distribution algorithm which uses modulo operation. This deterministic approach encourages an outsized network with better connectivity and less communication overhead through minimal memory requirement using a small key pool.

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