— In many defence network, connections of wireless devices carried by soldiers may be temporarily disconnected by jamming, environmental factors, and mobility, especially when they operate in hostile environments. Disruption-tolerant network (DTN) technologies are becoming successful solutions that allow nodes to communicate with each other in these extreme networking environments.DTN networks introduced storage nodes where data is stored or replicated such that only authorized mobile nodes can access the necessary information quickly and efficiently. In this proposed system, cipher-text policy attribute based encryption(CP-ABE) provides a scalable method of cipher data such that the encryptor defines the attribute set that the decryptor needs …show more content…
1. Architecture of secure data retrieval in a disruption-tolerant military network

A. System Description and Assumptions Fig. 1 shows the architecture of the DTN. As shown in Fig. 1, the architecture consists of the following system entities.
1) Key Authorities: They are key generation centers that generate public/secret parameters for CP-ABE. The key authorities consist of a central authority and multiple local authorities. We assume that there are secure and reliable communication channels between a central authority and each local authority during the initial key setup and generation phase. Each local authority manages different attributes and issues corresponding attribute keys to users. They grant differential access rights to individual users based on the users’ attributes. The key authorities are assumed to be honest-but-curious. That is, they will honestly execute the assigned tasks in the system, however they would like to learn information of encrypted contents as much as possible.
2) Storage node: This is an entity that stores data from senders and provide corresponding access to users. It may be mobile or static [4], [5]. Similar to the previous schemes, we also assume the storage node to be semitrusted, that