Delay Tolerant Network (DTN) addresses challenges of providing end-to-end service where end-to-end data forwarding paths may not exist. Security and privacy are crucial to the wide deployments of DTN. Without security and privacy guarantees, people are reluctant to accept such a new network paradigm. To address the security and privacy issues in DTNs, we in this paper have discussed the various open issues and challenges which need to be addressed to evolve the secure DTNs.
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