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Delay- and disruption-tolerant networking (DTN) is an active area of networking research on which our team at Trinity College Dublin has been working for several years. Our emphasis has always been on testing DTN technologies in the real world, to the extent that our funding allows. DTN aims to provide Internet like services for nodes that are in communications challenged areas and has applications in space networking, military tactical networking, and sensor networks. Together with partners in the FP7-funded Networking for Communications Challenged Communities (N4C) project, we've been deploying DTNs in Sweden and Slovenia over the past three years. Here, the author discusses our most recent trial and the security issues we had to address. We hope what we learned will be useful to other researchers transitioning technology from the lab to the real world.