1. Event Based Routing In Delay Tolerant Networks Rohit Mullangi And Lakshmish Ramaswamy DTN is fundamentally an opportunistic network environment, where communication links only exist temporarily, rendering it impossible to establish end- to-end connections for data delivery. DTN is characterized by highly mobile nodes, intermittent connectivity and frequent disruptions. Disruptions may occur because of limited wireless communication range, sparsity of nodes, attacks and general noise. The existing Internet protocols are not suitable for all environments, due to some fundamental assumptions built into the Internet architecture. They are: End-to-end path between source and destination exists for the duration of a communication session. All routers and end stations support the TCP/IP protocols We have designed a decentralized, quality of service aware event routing algorithm where routers maintain publisher and subscription statistics corresponding to hosts in its vicinity (hosts that can be reached within a few hops). This information would enable each router to estimate the number of matching subscribers that are expected to be reached (directly or through other routers) in the next T x time Units, given an event E. These statistics are used for several important purposes such as: deciding whether it is feasible to provide the level of service requested by a publisher/subscriber; and making event routing decisions to satisfy publisher, subscriber and application requirements. We are also considering the bandwidth and storage constraints. Specifically, links do not have enough bandwidth to execute all the data exchange that needs to occur between their end- routers before being disconnected, and routers do not have enough memory to store all the data that is being routed through them. The architecture was originally designed for the Interplanetary Internet (IPN), a communication system envisioned to provide Internet-like services across interplanetary distances in support of deep space exploration. At base, the vision behind this work is to try to extend the internet architecture to cater for more applications, especially those in context where it is very hard to use current networking technology. The generalization of this concept to encompass terrestrial applications is called Delay and Disruption Tolerant Networking(DTN). Delay And Disruption Tolerant Networking, By Stephen Farrell and Vinny Cahill. Karim El Defrawy, John Solis, Gene Tsudik, “Leveraging Social Contacts for Message Confidentiality in Delay Tolerant Networks” I would like to thank Dr.Ramaswamy for his advice and guidance. What is DTN ??Why ??Approach References Background Acknowledgements DTN Vlink and KioskNet, University Of Waterloo DiselNet, University Of Massachusetts N4C, EU/FP7 ResiliNets, University Of Kansas IPN Saratoga, University Of Surrey Deep Impact Networking, NASA JPL Real Time Testbeds The current problem I am trying to address is, How to integrate event-based workflows in to opportunistic network environment like delay tolerant networks (DTN) and enable different event applications such as disaster management, commerce in remote rural areas, event propagation in sensor networks etc. Problem