A rapid development of the Wireless Body Area Network (WBAN) has become very important for applications in telemedicine and m-health. However, there is still a need to ensure a reliable and secure communication in these systems. In this paper we present a novel multi-channel key deployment scheme for wireless body sensor networks. The proposed key deployment scheme requires no public key cryptography and therefore is suitable for CPU-constrained sensor nodes. The solution is implemented on

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... rcially available wireless sensor nodes while the performance of the system is shown through the experiments with users.