Abstract: Wireless sensor networks are networks consisting of nodes with sensors to monitor physical or environmental conditions. Resource constraint nature of wireless sensor network (WSN) turns the security issue certainly into a big challenge. Security is critical for sensor network due to the limited resource constraints nature of sensor nodes. Security can be provided in various ways such as in key generation, distribution, storage etc. In our work we present a secure framework against various attacks in WSN by three key management schemes and how the attacks are identified and protected by these three schemes. The proposed scheme has low memory consumption, computation time and energy to run in a node.. Also we propose a new energy efficient clustering algorithm which clusters the nodes in an energy efficient way and the data’s are distributed by Multipath broadcast protocol. Further, we prove that the proposed secure framework against various attack and performance is analyses with certain metrics. The work is organized as Section I-Introduction, Section II-Network Entities, Section III-Architecture, Section IV Clustering and Head selection, Section V-Proposed methods, Section VI- Evaluation metrics, Section VII-Performance analysis ,section VIII-Conclusion.