Underwater wireless sensor networks (UWSNs) are a subclass of wireless sensor networks. Underwater sensor
deployment is a significant challenge due to the characteristics of UWSNs and underwater environment. Recent
researches for UWSNs deployment mostly focus on the maintenance of network connectivity and maximum
communication coverage. However, the broadcast nature of the transmission medium incurs various types of security
attacks. This paper studies the security issues and threats of UWSNs topology. Based on the cluster-based topology, an
underwater cluster-based security scheme (U-CBSS) is presented to defend against these attacks. and safety.