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Cluster based organization is widely used to achieve energy efficiency in Wireless Sensor Networks (WSN). In order to achieve confidentiality of the sensed data it is necessary to have secret key shared between a node and its cluster head. Key management is challenging as the cluster head changes in every round in cluster based organization. In this paper we are proposing and prototyping a scheme which ensures that always there exists a secret key between node and its cluster head. The proposed scheme is a deterministic scheme which establishes key in an efficient manner every time a cluster head is changed. Simulation results show that the energy required to establish key in each round by cluster head is same as that of probabilistic scheme. Storage at each node is optimized in the proposed scheme.