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An Efficient Certificateless Aggregate Signature Scheme for Blockchain-Based Medical Cyber Physical Systems

机译：基于区块链的医学网络物理系统的高效无证书聚合签名方案

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摘要

Different from the traditional healthcare field, Medical Cyber Physical Systems (MCPS) rely more on wireless wearable devices and medical applications to provide better medical services. The secure storage and sharing of medical data are facing great challenges. Blockchain technology with decentralization, security, credibility and tamper-proof is an effective way to solve this problem. However, capacity limitation is one of the main reasons affecting the improvement of blockchain performance. Certificateless aggregation signature schemes can greatly tackle the difficulty of blockchain expansion. In this paper, we describe a two-layer system model in which medical records are stored off-blockchain and shared on-blockchain. Furthermore, a multi-trapdoor hash function is proposed. Based on the proposed multi-trapdoor hash function, we present a certificateless aggregate signature scheme for blockchain-based MCPS. The purpose is to realize the authentication of related medical staffs, medical equipment, and medical apps, ensure the integrity of medical records, and support the secure storage and sharing of medical information. The proposed scheme is highly computationally efficient because it does not use bilinear maps and exponential operations. Many certificateless aggregate signature schemes without bilinear maps in Internet of things (IoT) have been proposed in recent years, but they are not applied to the medical field, and they do not consider the security requirements of medical data. The proposed scheme in this paper has high computing and storage efficiency, while meeting the security requirements in MCPS.
机译：与传统的医疗保健领域不同，医疗网络物理系统（MCPS）更加依赖无线可穿戴设备和医疗应用程序来提供更好的医疗服务。医疗数据的安全存储和共享面临着巨大的挑战。具有去中心化，安全性，可信性和防篡改功能的区块链技术是解决此问题的有效方法。但是，容量限制是影响区块链性能提高的主要原因之一。无证书聚合签名方案可以极大地解决区块链扩展的困难。在本文中，我们描述了一个两层系统模型，其中病历存储在区块链外并在区块链上共享。此外，提出了一种多活门哈希函数。基于提出的多活门哈希函数，我们提出了基于区块链的MCPS的无证书聚合签名方案。目的是实现对相关医务人员，医疗设备和医疗应用程序的认证，确保医疗记录的完整性，并支持医疗信息的安全存储和共享。所提出的方案由于不使用双线性映射和指数运算，因此具有很高的计算效率。近年来，提出了许多无双线性物联网的无证书聚合签名方案，但它们并未应用于医疗领域，也没有考虑医疗数据的安全性要求。本文提出的方案在满足MCPS安全性要求的同时，具有较高的计算和存储效率。

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