Wireless sensor network (WSN) has increasingly been used for many applications such as building distributed systems, military applications, remote environmental monitoring and target tracking among others. This has been enabled by the availability, particularly in recent years, of sensors that are smaller, cheaper and intelligent. However, sensor nodes operate on limited battery power, energy usage is a very important concern in a WSN. There has been significant research focus that revolves around harvesting and minimizing energy. In this paper, we propose a modified algorithm of Low Energy Adaptive Clustering Hierarchy (LEACH) protocol for Content based WSNs. Our modified protocol called AEEC (Adaptive and Energy Efficient Clustering) algorithm is aimed at prolonging the lifetime of a sensor network by balancing energy usage of the nodes in content based WSNs. AEEC makes the nodes with more residual energy have more chances to be selected as cluster head. Hence, we avoided single node failure due to maximize connectivity of network. We compared the performance of our AEEC algorithm with the LEACH protocol using simulations.
Keywords-component; wireless sensor network, clustering algorithm, content based networking model.I.
Blockchain is a technology that provides security features that can be used for more than just cryptocurrencies. Blockchain achieves security by saving the information of one block in the next block. Changing the information of one block will require changes to all the next block in order for that change to take effect. Which makes it unfeasible for such an attack to happen. However, the structure of how blockchain works makes the last block always vulnerable for attacks, given that its information is not saved yet in any block. This allows malicious node to change the information of the last block and generate a new block and broadcast it to the network. Given that the nodes always follow the longer chain wins rule, the malicious node will win given that it has the longest chain in the network. This paper suggests a solution to this issue by making the nodes send consistency check messages before broadcasting a block. If the nodes manage to successfully verify that the node that generated a new block hasn't tampered with the blockchain than that block will be broadcasted. The results of the simulation show suggested protocol provided better security compared to the regular blockchain.
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