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In recent years, Mobile Wireless Sensor Network (MWSN) has derived the attention of vendors and researchers as it being the state-of-art technology in the areas of battle field surveillance, medical and military application etc. The Mobile Double Cluster Head-Particle Swarm Optimization (MDCH-PSO) algorithm is proposed for optimization in hybrid mobile network with a heterogeneity. This paper proposes an algorithm Secure-MDCH (S-MDCH) to improve the security aspects of MDCH-PSO algorithm. In S-MDCH, intercluster and intra-cluster key generation algorithms are explained to prevent the network from malicious node attack and CH compromising. This ensures secure communication in the network. A unique mobile key '' is used by all nodes to avoid malicious node from entering the cluster through handoff and to prevent 'information learning'. Simulation results shows that packet delivery ratio of the proposed algorithm is 8.25% higher than LEACH-M and average residual energy is improved by 2.802%.

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