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In this paper, we propose an enhancement to the secure routing protocol SecOPP. SecOPP provides the most security services such as integrity, authentication, confidentiality and freshness of data. All these services are obtained with low energy consummation. In addition, this protocol is characterized by little stockade places and reduced computational cost. Despite its robustness against attacks and its scalability, SecOPP in its current application is static. It does not allow secure addition of new nodes. Each node has a limited life time, when batteries became empty, node dies. We propose to securely add new nodes on network to increase its longevity, making it more reliable and robust. This is well verified through simulations with TOSSIM using NesC language.

Due to their inherent features Wireless Sensor Networks (WSNs) are vulnerable to many security threats. Moreover, traditional security mechanisms cannot be directly used in WSNs as they present constrained resources in terms of communication, computation and energy. Trust management models have recently been suggested as an e ective security mechanism for WSNs. The already found solutions are very expensive in terms of energy and memory, which seriously affects the lifetime of such networks. In this paper, we will present a lightweight trust management model, which guarantees the reliability and robustness of the network, seeking to increase its lifetime compared to existing models.