摘要
医疗数据具有较高的私密性和敏感性,然而以往的医疗数据共享过程中往往采取中心化的集中式存储,这带来了数据隐私泄露和非法篡改的风险。针对上述问题,文中将区块链和代理重加密技术结合起来,提出基于条件代理重加密的区块链医疗数据共享模型。各级医院组成联盟区块链,采用改进的实用拜占庭共识机制选取代理节点,提高了节点达成共识的效率。借助于云服务器海量的存储能力,将患者的医疗数据存储在云服务器,联盟区块链中保存条件摘要密文,数据请求者在联盟链上进行条件搜索获取患者医疗数据,同时利用代理重加密技术实现特定数据请求者和第三方用户之间的细粒度共享。实验结果证明,基于条件代理重加密的区块链医疗数据共享模型在通信和计算开销方面更具优势。
Medical data has high privacy and sensitivity.However,in the past,centralized storage was often adopted in the process of medical data sharing,which brought the risk of data privacy leakage and illegal tampering.In view of the above,a blockchain medical data sharing model based on conditional proxy re⁃encryption is proposed by combining blockchain and proxy re⁃encryption technology.Hospitals at all levels form an alliance blockchain,and an improved practical Byzantine fault tolerance(PBFT)mechanism is adopted to select proxy nodes,which improves the efficiency of reaching consensus among nodes.With the massive storage capacity of cloud servers,the patients'medical data are stored in the cloud server.The conditional summary ciphertext is stored in the alliance blockchain,and the data requester performs conditional search on the alliance chain to obtain the patients'medical data.At the same time,the proxy re⁃encryption technology is used to realize fine⁃grained sharing between the specific data requester and the third⁃party user.Experimental results show that the blockchain medical data sharing model based on conditional proxy re⁃encryption has more advantages in communication and computational overhead.
作者
尚龙飞
王华杰
徐露
SHANG Longfei;WANG Huajie;XU Lu(Faculty of Information Engineering and Automation,Kunming University of Science and Technology,Kunming 650500,China)
出处
《现代电子技术》
北大核心
2024年第1期78-83,共6页
Modern Electronics Technique
基金
云南省区块链应用技术重点实验室开放课题(YNB202111)。
关键词
区块链
代理重加密
医疗数据共享
访问控制
去中心化
共识算法
数据存储
blockchain
proxy re⁃encryption
medical data sharing
access control
decentralization
consensus algorithm
data storage
