@article{ author = {Iqbal, Siddiq, Sujatha, B R }, title = {Secure Key Management Scheme for Hierarchical Network Using Combinatorial Design}, journal = {Journal of Information Systems and Telecommunication (JIST) }, year = {2022}, volume = {10}, number = {37}, pages = {20-27}, doi = {10.52547/jist.15691.10.37.20} }