Novel Key Management Techniques in Three-Tier Wireless Sensor Networks

The Three Tier Security Scheme for Wireless Sensor Networks (WSNs) was introduced basically to improve the cost efficiency of the system. This is because the incorporation of asymmetric keys increases the computational and memory costs. But, the cost of key pre distribution schemes is low and they provide secure communication between Sensor Nodes (SNs) and mobile sinks. However, Pair wise key establishment is not provided for guarantying security. Hence, we propose Novel Key Management Technique in Three Tier (NKM_TT) Wireless Sensor Networks to manage the security methods in a WSN. In this scheme, we use Message Authentication Code (MAC) to provide the data integrity. Digital signature grants authentication between the MS and AP as well as the Session Pairwise key provides authentication between AP and SN. Our analytical results indicate that the new security technique makes the network more resilient to both MS and stationary AP security and minimizes the computation cost compared to the polynomial pool-based approach.