1. Ahmed Osama

2. What is Delay Tolerant Network?What is Delay Tolerant Network? DTN- WINC- Nile University2 IntroductionChallengesSummary S S D D No continuous route exist between the source and destination

3. What is Delay Tolerant Network?What is Delay Tolerant Network? DTN- WINC- Nile University3 IntroductionChallengesSummary S S D D Use opportunistic routing to deliver packets (Mobility case) I I

4. What is Delay Tolerant Network?What is Delay Tolerant Network? DTN- WINC- Nile University4 IntroductionChallengesSummary S S D D Use opportunistic routing to deliver packets (Scheduled wake up) I I I I I I

5. What is meant by extreme environment?What is meant by extreme environment? DTN- WINC- Nile University5 IntroductionChallengesSummary

6. Challenges that concern us DTN- WINC- Nile University6 IntroductionChallengesSummary

7. Network Coding in delay tolerant network DTN- WINC- Nile University7 In delay tolerant network; realistic network environment suffers from limited bandwidth and node buffers. In such environment, we need to deliver packets with minimal delivery delay under no precise knowledge, with taking into account limited buffer length IntroductionChallengesSummary

8. In a cooperative environment and non cooperative DTN- WINC- Nile University8 The need to send an updated version of file to N nodes to be stored; these nodes are mobiles So we need to examine different ways in distributing files which change dynamically. “In Delay tolerant Network” Generic Examples File change from time to time(weather forecasting) Backup files Software update patches IntroductionChallengesSummary

9. I am very concerned with Traffic analysis DTN- WINC- Nile University9 1.Because traffic analysis is dangerous, why? 2.Naïve solution (L2L encryption) will introduce a huge overhead in addition to its failure if an intermediate nodes were compromised. IntroductionChallengesSummary

10. To sum up DTN- WINC- Nile University10 1.Delay tolerant network coding is a network where no continuous path exist between source and destination 2.Delay tolerant network coding is used in extreme networks IntroductionChallengesSummary

11. DTN- WINC- Nile University11 Web Resources en.wikipedia.org/wiki/Delay-tolerant_networking www.dtnrg.org/ www.ipnsig.org/ Papers E. Altman, P. Nain, and J. Bermond. Distributed storage management of evolving files in delay tolerant ad hoc networks. In Proc. of IEEE INFOCOM, 2009. Y. Fan, Y. Jiang, H. Zhu, and X. Shen, "An Efficient Privacy-Preserving Scheme against Traffic Analysis Attacks in Network Coding", Proc. IEEE INFOCOM'09, Rio de Janeiro, Brazil, April 19-25, 2009. Y. Lin, B. Liang, and B. Li, “Performance Modeling of Network Coding in Epidemic Routing,” in Proc. of the First ACM International Workshop on Mobile Opportunistic Networking (MobiOpp), 2007.

12. Thank you for listening