MedExChain: Enabling Secure and Efffcient PHR Sharing Across Heterogeneous Blockchains

TL;DR

MedExChain is a cross-chain data sharing scheme that securely and efficiently enables Personal Health Records to be shared across heterogeneous blockchain systems, addressing performance and security challenges in IoMT environments.

Contribution

It introduces a novel cross-chain sharing scheme with cryptographic and audit mechanisms, optimized for IoMT devices and diverse blockchain architectures.

Findings

Reduces computation and communication overhead significantly.

Ensures secure PHR sharing across heterogeneous blockchains.

Validated robustness through comprehensive security analyses.

Abstract

With the proliferation of intelligent healthcare systems, patients' Personal Health Records (PHR) generated by the Internet of Medical Things (IoMT) in real-time play a vital role in disease diagnosis. The integration of emerging blockchain technologies signiffcantly enhanced the data security inside intelligent medical systems. However, data sharing across different systems based on varied blockchain architectures is still constrained by the unsolved performance and security challenges. This paper constructs a cross-chain data sharing scheme, termed MedExChain, which aims to securely share PHR across heterogeneous blockchain systems. The MedExChain scheme ensures that PHR can be shared across chains even under the performance limitations of IoMT devices. Additionally, the scheme incorporates Cryptographic Reverse Firewall (CRF) and a blockchain audit mechanism to defend against both internal and external security threats. The robustness of our scheme is validated through BAN logic, Scyther tool, Chosen Plaintext Attack (CPA) and Algorithm Substitution Attack (ASA) security analysis veriffcation. Extensive evaluations demonstrate that MedExChain signiffcantly minimizes computation and communication overhead, making it suitable for IoMT devices and fostering the efffcient circulation of PHR across diverse blockchain systems.