Mobility prediction and fault tolerance are extremely difficult due to underwater characteristics. Energy drain is one of the major causes for node faults.Hence, in this research article, a hybrid optimization algorithm is developed for fault-tolerant and accurate localization in UWSN. In this technique, Artificial Butterfly Optimization (ABO) algorithm is applied for finding the distance between the anchors and the sensors. Each non-localized node runs ABO algorithm for finding the distance amid the anchor or beacon nodes. Then, applying Quaternion-based Backtracking Search Optimization (QBSA) algorithm, non-localized sensor nodes are localized and to decrease the localization error based on the Received Signal Strength Indicator (RSSI), battery energy, and distance parameters. Aqua-Sim a tool kit of NS2 is an open-source software developed for Underwater Wireless Sensor Network research, and this proposed algorithm will be implemented using this software. By simulation results, it is shown that the proposed optimization algorithm reduces the localization error, latency, and cost and energy consumption.
In this technological arena, a firewall is a major tool for network security system to predetermine its basic rules so that it can control and monitor incoming and outgoing network traffic. The firewall generally restricts the faulty and unusual data entering the system. It can be categorized as host-based firewalls and network-based firewalls. There are various applications of firewall and how these firewalls can help the underwater wireless sensor network (UWSN) in protecting the sensor nodes where a huge amount of sensitive data is communicated among different countries. Firewall mainly aims to secure the network from different attacking devices and the attackers in a very efficient way. Firewall creates a barrier in which only the authorized data can be passed through after continuously checking by the firewall policies. To protect a local system and network of system from threats which are generally network based firewall is the most effective way. The design of the firewall is required to be accurate as it acts as a filter at higher protocol layer and some levels of IP-packets.
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