Key Pre-distribution Scheme in three tier networks !!!!!!!!!

"We propose an enhanced unital-based key pre-distribution scheme that maintains a good key sharing probability while enhancing the network scalability. A preliminary work and few discussions were presented in The contributions of our work are many folds and can be summarized in the following points:
• We review the main state of the art of symmetric key management schemes for WSNs that we classify into two categories: probabilistic schemes and deterministic ones. We further refine the classification into sub-categories with respect to the underlying concepts and techniques used in key exchange and agreement.
• We introduce, for the first time, the use of unital design theory in key predistribution for WSNs. We show that the basic mapping from unitals to key pre-distribution gives birth to an extremely highly scalable scheme while providing low probability of sharing common keys."
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