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This paper addresses the path-key establishment exposure problem commonly encountered in key predistribution schemes in WSNs. A robust path-key establishment framework is proposed, which uses multiple secured paths for the negotiation and exchange of symmetric keys between end nodes. Since the scheme ensures that each key share can be revealed only to one node on each path, the exposure of that key nugget is minimized. The analysis shows that the proposed scheme can greatly improve the security of key establishment. Furthermore this scheme assumes no specific routing protocols, and therefore, it is not dependent on the physical topology of the network. As long as the network is connected and there are enough nodes deployed, the proposed scheme can be incorporated to most key predistribution schemes without significant changes. Robustness is achieved through redundant information such that not all packets are required to obtain the key. After an introduction they introduce related work. Then they describe the robust key establishment framework to secure the path-key using multiple proxies. Furthermore, it is shown how to discover such proxies in two algorithms. The security analysis and simulation results show that this scheme can achieve a high level of security.