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Abstract
Mobile nodes in social environments such as a battlefield or a hostile region are likely to suffer from intermittent network connectivity and frequent partitions. Disruption tolerant network technologies are becoming successful solutions that allow wireless devices carried by soldiers to communicate with each other and access the confidential information or command reliably by exploiting external storage nodes. Some of the most challenging issues in this scenario are the enforcement of authorization policies and the policies update for secure data retrieval. Cipher text policy Anonymous Location Enabled Routing Encryption (CP-ALERT) is a promising cryptographic solution to the access control issues. However, the problem of applying CP-ALERT in decentralized OSN introduces several security and privacy challenges with regard to the attribute revocation, key escrow, and coordination of attributes issued from different authorities. The proposition of a secure data retrieval scheme using CP-ALERT for decentralized OSN where multiple key authorities manage their attributes independently is stated. The demonstration to apply the proposed mechanism to securely and efficiently manage the confidential data distributed in the disruption tolerant military network.