摘要：WSN is a way of handling dangerous and hostile environments safely. It replaces human existencewith nodes and units that could sustain its existence under extreme circumstances. The significance of WSNarises from the importance of the data gathered through its nodes. Due to the fact of WSN that it is open airenvironment, security issues must be considered for example authentication of new units and the encryptionof data transmitted between these units. This research provides a new model covering two important aspectsin WSN. The first aspect is the creation of the key that will be used for the current session between a pair ofnodes. In this step the research introduces the intuitionistic fuzzy sets to handle the WSN criteriasimultaneously and efficiently in order to decide the exact key length required depending on the status of thenetwork parameters. The second aspect is the distribution of the key between the units desiringcommunications. This phase starts by authenticating each entity to each other and to the cluster head, thenone unit suggests a key and the other one confirms. It then starts communication using that key. This phaseshows the hybrid cryptography applied in which the algorithm uses asymmetric encryption for authenticationthen uses symmetric encryption to secure the connection between the two units. Experimental results in thisresearch could categorized also into two classes. The first class is key size model in which the proposed modelcompared to ordinary KNN and fuzzy model related to the determination of the key size. The proposed modelshows an overall efficient way relating to decide the key size. The second class of experiments is to distributethe intermediate key efficiently at this point the proposed model shows resilience and efficiency compared todistributing the key directly through cluster head.
