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Privacy and security in Delay-Tolerant Networks (DTNs) have been an active research topic in the recent years, especially, as people can be involved in these networks and use their mobile devices to forward each other's messages. Such communications require forwarding algorithms that often include replication or context awareness. In this paper, the authors study the security impact on specific forwarding protocols in both simulated City Scenario and using real connectivity data traces. They propose a hybrid technique combining Erasure Coding and distributed replication to defend against packet dropping malicious attack. They show that replication-alone technique - that is typically expected to improve performance and robustness - is greatly affected by such simple attacks.
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