Wireless body area networks (WBANs) are widely used in telemedicine, which can be utilized for real-time patients monitoring and\nhome health-care.Thesensor nodes inWBANs collect the client�s physiological data and transmit it to the medical center.However,\nthe clients� personal information is sensitive and there are many security threats in the extra-body communication. Therefore,\nthe security and privacy of client�s physiological data need to be ensured. Many authentication protocols for WBANs have been\nproposed in recent years.However, the existing protocols fail to consider the key update phase. In this paper, we propose an efficient\nauthenticated key agreement scheme for WBANs and add the key update phase to enhance the security of the proposed scheme.\nIn addition, session keys are generated during the registration phase and kept secretly, thus reducing computation cost in the\nauthentication phase. The performance analysis demonstrates that our scheme is more efficient than the currently popular related\nschemes.
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