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Given the sensitivity of the potential applications of wireless sensor networks and because of resource limitations, security emerges as a challenging issue in these networks. Key management is one of the required building blocks of many security services. Unfortunately, public key based solutions, which provide efficient key management services, are unsuitable for WSN because of resource limitations. Then, symmetric key establishment is the favorite paradigm for securing exchanges in WSN. In this work, we resume our contributions to enhance the resilience of WSN key pre-distribution schemes through hash chaining. We present our solutions as well as analytical analysis and simulation results which show that our approaches enhance the network resiliency without introducing overheads compared to existing solutions.