A novel pairing free certificateless aggregate signcryption scheme for IoMT

Abstract

In the Internet of Medical Things (IoMT), medical sensor nodes generate patient health data, which is then forwarded to healthcare providers for diagnosis. Ensuring the authenticity, integrity, and confidentiality of this sensitive information is critical. Given the resource constrained nature of sensor nodes, a pairing free certificateless aggregate signcryption (CLASC) scheme is the optimal solution. We begin by analyzing a recently proposed CLASC scheme and demonstrate that it lacks the unforgeability property. To address this issue, we propose a secure pairing free CLASC scheme. Our detailed security analysis confirms that our scheme meets all essential security requirements. Furthermore, performance analysis shows that our scheme offers the lowest communication and computational overhead associated with the resource limited sensor nodes compared to existing CLASC schemes, making it well-suited for IoMT environments.