Wireless Sensor Networks (WSNs) can be used in military environments such as a battlefield tracking the enemies. One of the challenging issues in this scenario is enforcement of authorization policies and the policies update for secure data retrieval. CP-ABE is using efficient and secure data retrieval method for decentralized DTNs. However implementing Cipher text-Policy Attribute-Based Encryption (CP-ABE) in decentralized DTNs where the key authorities might be compromised or not fully trusted. In this paper, the authors propose a secured data retrieval method using cluster tree based model proposes grouping the slave nodes, where each node has an individual group head.