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IoT has a huge issue of security and protection because of its dynamic and heterogeneous nature. In the IoT environment, authentication is one of the most testing security prerequisites. Because a client can straightforwardly access data from the devices, given the mutual validation among client and device occurs. The research includes a CL-EKM and verified key establishment scheme has been proposed for secure communication in the IoT environment. Proposed system utilizing a multicast verification procedure which improves the adaptability of CL-EKM by empowering a delivery message from BS to an enormous cluster head hub with an acceptable delay and cost. Also, the proposed framework is contrasted with the current unicast and broadcast strategies which would cause a serious negative effect on the performance when a network size increases or when quantity of data to be communicated for a time given is enormous. The proposed results examined for security and is additionally implemented utilizing a simulator.