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Under-Water Sensor Network (UWSN) is a novel networking paradigm to explore the uninhabited oceans. However, the characteristics of this new network, such as huge propagation delay, floating node mobility, and limited acoustic link capacity, are significantly different from land-based sensor networks. In this paper, the authors show that underwater denial-of-service attack imposes great threats to any UWSN. Without proper countermeasures, underwater sensor networking is a mission impossible. They propose a localization based approach to answer the challenge. In their design, DUB and DDB, a pair of efficient single-round distance measuring schemes, are critical building blocks to realize their approach inspite of constrained node capability and floating node mobility.
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