基于区块链技术的健康医疗数据隐私加密控制系统设计

Design of health and medical data privacy encryption control system based on blockchain technologySUN Xu? ZHANG Yu、LIAO Xinqi

摘要:

为确保电子健康记录系统尽快实现安全地医疗数据共享,克服传统隐私加密控制模型访问时延增长率较高,控制效果不够平稳的问题,本文基于区块链技术对健康医疗数据隐私加密控制系统进行了设计研究。采用C/S体系结构,设计了4层的基于区块链技术的的加密控制系统硬件。在系统软件的软件部分,采用了基于无证书公钥体制的内容提取签名方案,完成了对健康医疗数据隐私保护功能的设计。采用区块链技术,提出了数据加密访问控制方法MDACSC,在该方法中设计区块结构和链式存储结构,将后序遍历策略树匹配算法与分类分级属性算法应用到访问控制结构中提升访问控制效率,完成对健康医疗数据的加密访问控制。采用PoP-DPoS算法设计了改进共识机制,以确定记账权归属,优化了加密控制方法。经实验测试实现了对健康医疗数据隐私的加密控制,结果表明:该模型访问时延增长率较低,具有平稳、高效的访问控制性能,密文小、加密成本低,解密成本极高,并且数据安全系数达到了0.98,说明该系统总体应用效果良好。

Abstract:

To ensure the secure sharing of medical data in the electronic health record system, this paper presents a design study on a privacy encryption control system for health medical data based on blockchain technology. A client-server architecture is adopted, and a 4-layer hardware system based on blockchain technology is designed. In the software part of the system, a content extraction signature scheme based on certificateless public key cryptography is employed to achieve the design of privacy protection for health medical data. By utilizing blockchain technology, a data encryption access control method named MDACSC is proposed, block structure and chain storage structure are designed in this method, which integrates the post-order traversal policy tree matching algorithm and the classification and hierarchical attribute algorithm into the access control structure to improve the efficiency of access control. Additionally, an improved consensus mechanism is designed using the PoP-DPoS algorithm to determine the ownership of accounting rights, the encryption control method is optimized. Through experimental tests, the achieved results demonstrate that the proposed model has a lower growth rate of access delay, and it exhibits stable and efficient access control performance. The ciphertext size is small, and the encryption cost is low, while the decryption cost is extremely high. Furthermore, the data security coefficient reaches 0.98, indicating that the overall application effect of the system is good.