A Novel Key Management Scheme for WSNs

A new key management protocol for wireless sensor network was put forward based on one-way key chain, which could afford deterministic security and could reduce the storage cost compared with existing typical pre-distribution protocols. This protocol could distribute, evict and renew the cluster-key by one-time local broadcasting based on the difficulty of factorization of polynomial, and resolve the problems of lower resiliency to node capture and higher communications for key distribution and renewing. Performance and simulation results show that this protocol can afford the best security to the node capture attacking and requires lower storage cost; moreover, it also can reduce the communication cost of key distribution and renewing from o(N, o(n) to o(N_c), o(I) respectively.