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Wireless body area networks (WBANs) are expected to play an important role in monitoring the health information and creating a smart, reliable, and ubiquitous healthcare system. Only authorized users can access the network since the collected data by the WBANs are used to diagnosed and treated. However, it is still a challenging task to design a cost-effective and secure access control scheme because of inherent characteristics of the WBANs, such as open medium channel, limited resources of sensor nodes, and the absence of fixed infrastructure. In this paper, we first propose a novel certificateless signcryption scheme, and then, design a cost-effective and anonymous access control scheme for the WBANs using the novel signcryption. The proposed access control scheme achieves anonymity, confidentiality, authentication, integrity, and nonrepudiation. Compared with existing three access control schemes for the WBANs, our proposed scheme has the least computational cost and total energy consumption for the controller. [ABSTRACT FROM PUBLISHER]

In today's world, Internet of Things (IoT) has penetrated every aspect of us. The security of IoT is challenging because of the open nature of wireless communication and limited resources of sensor nodes (SNs). In this paper, we propose an efficient heterogeneous signcryption scheme from IoT to an Internet server, in which the server is in a public key infrastructure (PKI) environment, while the IoT is in a certificateless cryptosystem (CLC) environment. The proposed scheme is briefly referred to as CP-EHSC. CLC can settle the drawbacks of key escrow in identity-based cryptography (IBC) and public key certificate management in PKI. At the same time, PKI is suitable for the server since it has been widely adopted on the Internet. Our proposed scheme can provide security proof in the random oracle model (ROM). Performance analysis shows that the proposed scheme not only achieves great optimization in calculation cost and communication consumption but also makes great progress in total energy consumption. In addition, we illustrate the practical applicability of our proposed scheme by providing a realistic use case scenario. [ABSTRACT FROM AUTHOR]