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In wireless medical sensor network (WMSN), bio-sensors are implanted within the patient body to sense the sensitive information of a patient which later on can be transmitted to the remote medical centers for further processing. The patient’s data can be accessed using WMSN by medical professionals from anywhere across the globe with the help of Internet. As the patient sensitive information is transmitted over an insecure WMSN, so providing a secure access and privacy of the patient’s data are challenging issues in WMSN environments. However, in literature, to provide secure data access, few user authentication protocols exist. Most of these existing protocols may not be applicable to WMSNs for providing user’s anonymity. To fill these gaps, in this article, we propose an architecture for patient monitoring health-care system in WMSN and then design an anonymity-preserving mutual authentication protocol for …