Blockchain-Enabled Quantum-Resistant Hybrid Isogeny-Based Signcryption Framework for Digital Twin-Assisted Healthcare Systems

The rapid proliferation of the Internet of Medical Things (IoMT) has facilitated the development of Digital Twin (DT) technology in healthcare, enabling real-time simulation and remote patient monitoring. However, the reliance on public communication channels exposes sensitive physiological data to severe security threats. Furthermore, the imminent advent of quantum computing renders traditional public-key cryptographic primitives (e.g., RSA and Elliptic Curve Cryptography (ECC)) vulnerable to Shor’s algorithm. To address these challenges, this article proposes a blockchain-enabled, quantum-resistant hybrid signcryption framework tailored for DT-assisted healthcare. We integrate Isogeny-Based Cryptography (IBC) signcryption that leverages the Commutative Supersingular Isogeny Diffie-Hellman (CSIDH) problem to ensure simultaneous confidentiality and unforgeability with post-quantum security guarantees. The proposed framework utilizes a private blockchain to ensure the immutability and traceability of medical data transactions between the physical patient and their digital twin. Simulation results demonstrate the blockchain’s scalability and show that, while isogeny-based primitives introduce computational overhead compared to classical methods, the scheme remains feasible for high-value medical data synchronization.