Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, China.
University of Science and Technology of China, Hefei, 230026, China.
J Med Syst. 2019 Aug 14;43(9):305. doi: 10.1007/s10916-019-1430-2.
The dissemination of electronic medical data among professional personnel has been perceived to be an important breakthrough for the discovery of new technologies and therapies for curing diseases. However, in the current medical data management, it is difficult to share medical data due to the fragmentation of medical data and the lack of effective sharing methods. On the other hand, the security of medical data is difficult to protect because the centralized data storage is vulnerable to attack and tampering. Therefore, we propose a model called Med-PPPHIS, which consists of a permission-less blockchain and a permissioned blockchain, named Med-DLattice, to serve the management of user's personal health information and form a chained protection mechanism for medical data. Med-DLattice features Directed Acyclic Graph (DAG) structure, where each account updates its Account-DAG asynchronously to other unrelated accounts. The Med-DLattice nodes can reach an efficient consensus with proposed DPoS-Quorum algorithm. Based on this model, by converting the medical data into on-chain tokens, a safe and efficient channel for data circulation is established, while the privacy of data is secured. We implement a prototype of Med-PPPHIS and introduce a blockchain-based closed-loop method for chronic disease management, which initially applies the model to national physique monitoring in Anhui Province, China. The performance of the model is evaluated by simulating 500 nodes on 25 AliCloud ECS virtual machines. Experimental result shows that Med-PPPHIS has low latency and high throughput, and the security analysis shows that the model is able to prevent Sybil attacks, DDoS attacks, etc.
电子医疗数据在专业人员中的传播被认为是发现治疗疾病新技术和疗法的重要突破。然而，在当前的医疗数据管理中，由于医疗数据的碎片化和缺乏有效的共享方法，医疗数据难以共享。另一方面，由于集中式数据存储容易受到攻击和篡改，医疗数据的安全性难以保护。因此，我们提出了一种名为 Med-PPPHIS 的模型，它由无权限区块链和权限区块链（Med-DLattice）组成，用于管理用户的个人健康信息，并形成医疗数据的链式保护机制。Med-DLattice 采用有向无环图（DAG）结构，其中每个账户都可以异步更新其账户 DAG 而无需其他相关账户的许可。Med-DLattice 节点可以使用我们提出的 DPoS-Quorum 算法达到高效共识。基于该模型，通过将医疗数据转换为链上代币，建立了安全高效的数据流通渠道，同时确保数据的隐私性。我们实现了 Med-PPPHIS 的原型，并引入了一种基于区块链的慢性病管理闭环方法，该方法最初将模型应用于中国安徽省的国民体质监测。通过在 25 台阿里云 ECS 虚拟机上模拟 500 个节点对模型进行了性能评估。实验结果表明，Med-PPPHIS 具有低延迟和高吞吐量的特点，安全性分析表明该模型能够防止 Sybil 攻击、DDoS 攻击等。
