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Nowadays, the technology of Internet of Things (IoT) is getting more and more important which brings a lot of convenience to people’s life and city’s development. As a key application of IoT, wireless body area networks (WBANs) provides people high quality of life and high level of medical service. However, due to the sensitiveness of medical system, security and privacy issues in WBANs are very important. In previous research, there are no comprehensive authentication protocols designed for WBANs according to its characteristics of network structure. In this paper, we propose an efficient multilayer authentication protocol and a secure session key generation method for WBANs. Firstly, we design a one-to-many group authentication protocol and a group key establishment algorithm between personal digital assistance (PDA) and each of sensor nodes with energy efficiency and low computational cost. Then, we …