Abstract
Wireless sensor network promises ubiquitous data
collection and processing for variety of commercial, healthcare
and military applications. P ractical realization of WSN
applications is possible only after assuring network security.
Cryptographic key distribution is an important phase in
network security which establishes initial trust in the network.
Secu rity p rotocol implementation in WSN is limited by
resou rce con stra in ed na tu re of sen sor nod es. Th e key
distribution algorithm satisfying security requirements of
given WSN application should be implemented with minimum
communication and memory overhead. As a solution to this
problem, hierarchical key management technique is proposed
in this paper. Symmetric key pre-distribution technique with
less computational overhead and ID-based asymmetric key
(IB K) d istribu tion tech niqu e with less commun ication
overhea d are app lied simultan eously in the network at
different levels. Resilience strength and resource overhead of
the proposed scheme is compared with both symmetric and
asymmetric techniques
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