Generally traffic and the sensor network security have many challenges in thetransmission of data in the network. The existing schemes consider homogeneoussensor networks which have poor performance and scalability. Due to many-to-onetraffic pattern, sensors may communicate with small portion of its neighbours.Key management is the critical process in sensor nodes to secure the data. Mostexisting schemes establish shared keys for all the sensors no matter whetherthey are communicating or not. Hence it leads to large storage overhead.Another problem in sensor network is compromised node attack and denial ofservice attack which occurs because of its wireless nature. Existing multi pathrouting algorithms are vulnerable to these attacks. So once an adversaryacquires the routing algorithm, it can compute the same routes known to thesource, and hence endanger all information sent over these routes. If anadversary performs node compromise attack, they can easily get the encryption/decryption keys used by that node and hence they can intercept the informationeasily. In this paper we are proposing a key management scheme which onlyestablishes shared keys with their communicating neighbour and a mechanism togenerate randomized multipath routes for secure transmission of data to thesink. Here we are adopting heterogeneous sensor networks and we are utilizingelliptic curve cryptography for efficient key management which is moreefficient, scalable, and highly secure and reduces communication overhead. Theroutes generated by our mechanism are highly dispersive, energy efficient andmaking them quite capable of bypassing the back holes at low energy cost.
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