Efficient and Secure Hierarchical Key Management Scheme for Wireless Sensor Networks using QR Decomposition Scheme

摘要

Wireless Sensor Network (WSN) assures to revolutionize sensing in a spatially dispersed and dedicated manner in various applications. It requires adopting a security mechanism for critical applications. Though many cryptographic algorithms are available it strength depends upon the key used for encrypting and decrypting the collected data. Key Management Scheme (KMS), a technique for establishing and maintaining the key relation, play a vital role in any security mechanism. The proposed work was focused on pairwise key establishment using QR based matrix Decomposition method. Though many metrics are available the prime factor for any WSN is key connectivity. The proposed KMS focuses on 100% key connectivity compared to probabilistic approach. For each communications different symmetric matrices are generated and are decomposed into Q and R matrix. This scheme is implemented in LPC2148 with Xbee to check its feasibility in real time applications. Performance analysis shows that the proposed method achieves 100% key connectivity, better resilience and scalability.