Pairwise key establishment practically and effectively is of great importance for industrial expansion of large networks with limited resources, such as wireless sensors. In these networks the nodes are extremely limited with regard to computing power, energy and bandwidth. In this thesis (chapter 5) we review HIMMO as a lightweight key predistribution for establishment of a common key among two nodes. It is the first efficient key predistribution scheme which has two highly secure and highly efficient features. Highly secure that means large collusions of nodes are tolerated and highly efficient means that the time required for key establishment is very short. Actually key establishment is done in a fraction of second only, even if devices are very limited such as 8-bit CPUs and if the memory footprint is low. The HIMMO scheme is suggestive of Blundo et.al.’s key predistribution scheme
