This study aim to give an analysis of the threats to privacy in wireless sensors in the context of the Internet of things and we review the pros and cons of some of the proposed solutions in order to ensure privacy. We propose a solution for the management of security keys based on symmetric encryption, taking into account two important factors, the sensors resources constraints and their mobility being linked to the patient body that may move occasionally. Tests gave significant results confirm that our proposed solution is secure, energy efficient and unable to deal with mobility. The field of healthcare knew an important development due to the evolution of the technology used in its applications, from sophisticated equipment in the operating rooms, to diagnostic and analysis equipment offering accurate and effective results. Among devices that have contributed to the development of the field of healthcare is the mobile monitoring sensors that are placed on the patient's body. By the emergence of the Internet of Things, it became possible to access to them remotely, so the possibility of offering patients a continuous and real-time monitoring and keep track of his health condition wherever he goes, from inside his home, in the street, in the workplace, etc. However, the main drawback of these applications is the lack of consideration of data security and privacy. The nature of these sensors from a wireless connection and limited capacities, making them vulnerable to a range of attacks aimed at eavesdrop or tamper patients' personal information.
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