State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing, 100876, China.
J Med Syst. 2018 Jul 2;42(8):149. doi: 10.1007/s10916-018-0996-4.
Currently, blockchain technology, which is decentralized and may provide tamper-resistance to recorded data, is experiencing exponential growth in industry and research. In this paper, we propose the MIStore, a blockchain-based medical insurance storage system. Due to blockchain's the property of tamper-resistance, MIStore may provide a high-credibility to users. In a basic instance of the system, there are a hospital, patient, insurance company and n servers. Specifically, the hospital performs a (t, n)-threshold MIStore protocol among the n servers. For the protocol, any node of the blockchain may join the protocol to be a server if the node and the hospital wish. Patient's spending data is stored by the hospital in the blockchain and is protected by the n servers. Any t servers may help the insurance company to obtain a sum of a part of the patient's spending data, which servers can perform homomorphic computations on. However, the n servers cannot learn anything from the patient's spending data, which recorded in the blockchain, forever as long as more than n - t servers are honest. Besides, because most of verifications are performed by record-nodes and all related data is stored at the blockchain, thus the insurance company, servers and the hospital only need small memory and CPU. Finally, we deploy the MIStore on the Ethererum blockchain and give the corresponding performance evaluation.
目前，区块链技术正在经历着工业和研究领域的指数级增长，其去中心化且对记录数据具有抗篡改的特性。在本文中，我们提出了 MIStore，这是一个基于区块链的医疗保险存储系统。由于区块链的抗篡改特性，MIStore 可能为用户提供高度的可信度。在系统的一个基本实例中，有医院、患者、保险公司和 n 个服务器。具体来说，医院在 n 个服务器之间执行（t，n）门限 MIStore 协议。对于该协议，如果节点和医院希望，任何区块链节点都可以加入协议成为服务器。患者的消费数据由医院存储在区块链中，并受到 n 个服务器的保护。任何 t 个服务器都可以帮助保险公司获得患者消费数据的一部分总和，这些服务器可以对其进行同态计算。但是，只要超过 n - t 个服务器是诚实的，n 个服务器就无法从区块链中记录的患者消费数据中获取任何信息。此外，由于大部分验证都是由记录节点执行的，并且所有相关数据都存储在区块链中，因此保险公司、服务器和医院只需要很小的内存和 CPU。最后，我们在以太坊区块链上部署了 MIStore，并给出了相应的性能评估。
