An efficient and certificateless conditional privacy-preserving authentication and key agreement scheme for smart healthcare

Smart healthcare overcomes the limitations of time and space, allowing users to access medical and health services anywhere and anytime, thus improving the quality and efficiency of these services. However, due to its excessive reliance on wireless public networks, smart healthcare faces challenges and issues related to communication security. As a result, authentication and key agreement are critical as the first line of defense for smart healthcare communications. Over the past few years, numerous authentication and key agreement schemes have been proposed by experts and scholars, but most of these schemes are not applicable to practical scenarios due to their lack of security and efficiency. To address these issues, we propose an elliptic curve-based certificateless conditional privacy-preserving authentication and key agreement scheme. This scheme does not require endorsement from a Certificate Authority (CA) and features lightweight and secure properties, making it suitable for resource-limited smart healthcare communication. In addition, the security of the proposed scheme is proven under the random oracle model, and its safety is supplemented using BAN logic. Finally, performance analysis reveals that the proposed scheme not only satisfies security property and can withstand general attacks but also offers certain advantages in communication efficiency.