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Energy based encryption and keying with collision avoidance in wireless sensor networks

Author:G. Ragunathan and L.Sherly Puspha Annabel

Abstract:
Designing cost-efficient, secure network protocols for Wireless Sensor Networks (WSNs) is a challenging problem because sensors are resource-limited wireless devices. Resource limited in the sense limited energy level, memory and computational capacity. Since the communication cost is the most dominant factor in a sensorâ€™s energy consumption. We introduce an Energy-Efficient Energy Based Encryption and Keying with Collision Avoidance scheme for WSNs that significantly reduces the number of transmissions needed for rekeying. This is done to avoid stale keys. Energy based encryption is a secure communication framework where sensed data is encoded using a scheme based on a permutation code generated by using the RC4 encryption mechanism. Dynamic keys are used for the packets in the stream. The intermediate nodes in the path verify the authenticity and integrity of the incoming packets. The key generated by the senderâ€™s virtual energy, this avoids the rekeying. Energy based encryption efficiently transfers data between the nodes that are added in the watched list. Energy based encryption reduces transmission overhead. Transmission overhead increases if the packet size and also while transferring control messages for rekeying. During data transmission, if more than one node transmits data to same destination at same time the data gets collided at the receiving side. Retransmission reduces the energy level of the sensor node. While data is transmitted by first node and the next node must wait in queue until the first node completes its transmission. This mechanism avoids data collision in the destination and also it results in energy savings of a node because there is no need to transfer the same data again and again to the same destination if data collision occurs during transmission.