Conceptual Design Proposed Secure Communication Scheme Secure Communication Scheme Design Shared Key Ke Secure Cryptographic L-node) Management Routing System Protocol Algorithms member K (L-node) distribution Management Public Key Shared Key cheme Protocol Cryptography Cryptography15 H-node Cluster￾head (L-node) Cluster member (L-node) H-node Shared Key Public key Secure Communication Scheme Design Secure Routing Protocol Key Management System Cryptographic Algorithms Key Pre￾distribution Scheme Key Management Protocol Public Key Cryptography Shared Key Cryptography Conceptual Design – Proposed Secure Communication Scheme