A multiple key management method in distributed sensor networks

Wireless sensor network (WSNs) with a mobile sink node (MS) has been widely concerned. In view of the low security in the basic random key pre-distribution scheme, and the vital role of MS in the research on key management, this paper proposed a new scheme (PPBR scheme) based on a composite key management schemes with polynomial pool-based key pre-distribution and basic random key pre-distribution. The scheme uses polynomial t-degree property to increase the difficulty of cracking the key by enemy and enhance the network resilience to node capture, meanwhile, improves the storage efficiency as heterogeneous features between MS and sensor nodes. The low connectivity is solved by introducing path key tree-based establishment method. Theoretical analysis and simulation experiments show that the proposed scheme has advantages in terms of network security, connectivity and storage effectiveness under the comprehensive consideration on different performance evaluation.