Information security is key important when we are trying to interconnect the wireless body sensor network with\nthe healthcare social network via mobile facilities. In this paper, we specially work on a secured electrocardiogram\n(ECG) signal transmission scheme to prevent further injuries for patients with heart diseases from human emotional\nstress. We proposed a dynamic encryption method via biometric information among frequency spectrums of ECG\nsignals, which can guarantee both high classification rate (>90 %) and system energy efficiency. At the same time,\ncooperative relays are applied for an additional spatial diversity gains. Simulation results show that the improved\ntransmission rate and signal power capacity can lower the probability of data intercept (LPI) and detection (LPD) by\ntaking the advantages of both temporal and spatial diversities. The network security thereby can be further\nimproved.
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