Abstract—Our purpose is to analyze how to benefit from the IoUT and explore, exploit and preserve the natural underwater resources. Delay/Disruption Tolerant Network (DTN) is essential part of the network heterogeneity communication network. Our expectation security area in DTN mechanism is to create adequate mechanism for Internet of Underwater Things. In this paper, an in-depth view of the IoUT and security challenges is provided. Internet of Underwater Things (IoUT) is defined as a world-wide network of smart interconnected underwater objects that enables to monitor vast unexplored water areas. Index Terms—Underwater Internet of Things, Delay/Disruption Tolerant Network, Bundle layer, security challenges, custody transfer. I. INTRODUCTION The earth’s surface 3/4 is covered by oceans, a continuous body of water that is customarily divided into several principal oceans and smaller seas. Those natural facts always confirm by humanity. The oceans regulate and determine climate on a global scale, and it is a fact that major disasters happen when climate is deregulated: cyclones, storms, and coastal flooding [1]. Destruction of wildlife due to global warming, changes in agricultural yields, extinction of species, and an increasing number of disease-carrying insects are also effects. The most important part of things used on the internet, are continuously connected to end-to-end, low-delay paths between sources and destinations [2]. It is obviously known that people are endeavoring and making a great attempt in evolving communication networks for the better all over the world and even in the galaxy as possible as they can . In the future, high quality network and reliable communication get everywhere, every time online things (communication devices) for instance: Internet of Things, Internet of Underwater Things and Interplanetary communications. heterogeneous communication network provides DTN, and Delay-tolerant networking is an approach to computer network architecture that seeks to address the technical issues in heterogeneous networks that may lack continuous network connectivity. Likewise, the Internet of Things is already a global phenomenon that is going to change our everyday life as much as our life was already revolutionized with the global use of Internet itself. Underwater acoustic communication is a technique of sending and receiving message below water [3]. There are several ways of employing such communication but the most common is using hydrophones. This paper is organized as follows: Introduction, Section II explains propose of the Custody transfer for internet of underwater things (IoUT). Section III gives the concept of analysis of security challenges Underwater Internet of Things. We conclude our paper and outline with future works. II. CUSTODY TRANSFER FOR INTERNET OF UNDERWATER THINGS DTN custody transfer is a service that may be optionally provided to a bundle as it is delivered through a DTN. When used, custody transfer keeps track of a current “responsible entity” or “custodian” for each bundle, and the custodian is required to keep the bundle safe in persistent memory until another custodian has received it successfully. The DTN architecture is targeted at network where an end-to-end routing path cannot be assumed to exist. Rather, routers are comprised of a cascade of time-dependent contacts communication opportunities used to move messages from their destinations. Contacts are parameterized to be their start and end times (relative to the source), capacity, latency, endpoints, and direction. In addition, each underwater physical object that contains both current and historical information on that object’s physical properties, origin and sensory context. This information is ubiquitous, available in real-time using different ways of communication Human to Thing (H2T) and Ting to Ting (T2T)) [4] and streamlines dramatically how to maintain and manage underwater habitats and resources. In this case, supplementary M2M mechanism and Smart house communication also provide DTN in the near the future our life. A. Overview Bundle layer and concept of underwater communication Literally, the capacity of the communication network will improve and encourage each public and private costumer (which request communication network things), which can be provided with quality and enhancement. Delay/Disruption tolerant network (DTN) is characterized to be intermittent connectivity, asymmetric link, high propagation delays or disruption of communication line and then high packet error rate; end-to-end functionality can and should be integrated into Bundle layer. Currently DTN has been proposed as global overlay architecture to provide network connectivity in challenged environments such as a deep-space communication field. According to the custody transfer mechanism, bundles are transmitted in a “store-and-forward” technique while the responsibility of reliable transfer is delegate to the next node in a route towards the final destination. DTN mechanism provides two fundamental things: Security challenges of DTN Mechanism for IoUT Khamdamboy Urunov., Jung-Il Namgung and Soo-Hyun Park, Kookmin University, Seoul Korea