【作者】 李亚辉；

【导师】 黄启春； 胡斌；

【作者基本信息】 浙江大学 ， 工程硕士（专业学位）， 2021， 硕士

【摘要】 随着我国社会经济水平的持续发展,人们对于医疗服务水平的要求也在不断的提高。然而当下医疗机构之间信息系统不互通造成的数据孤岛现状严重阻碍了医疗服务水平和效率的进一步提升。于此同时,医疗数据因为其高价值,易于被攻击的特点而导致的数据泄露事件时有发生。本文针对当下的现状,提出了一个基于区块链的电子病历共享系统,以期解决电子病历共享难和医疗数据泄露等问题。本系统的核心主要采用了Hyperledger Fabric联盟链框架并结合IPFS(Inter Planetary File System)星际存储文件系统,形成了“链上索引,链下存储”的存储模式。该模式在链上存储电子病历的索引信息并通过用户公钥加密防止泄露,同时确保了病历索引去中心化存储、不可篡改和可追溯等优势。另外,该模型又利用IPFS分布式存储技术,通过在链下存储病历密文,有效的降低了区块链系统的通信和存储压力。于此同此,用户通过代理重加密算法授予其他用户的解密权限,只有被授权的用户才可以解密病历密文,确保了病历记录安全可信的共享。本文根据系统的具体实现给出系统的测试方案,并对系统进行了功能测试和系统测试,最后对测试结果和系统的安全性进行了分析,证实系统达到预期的效果。更多还原

【Abstract】 With the continuous development of our country’s economic level,people are also pursuing better medical services.However,the data islands between medical institutions are an obstacle to the further development of medical services.At the same time,data leakage incidents occur from time to time because of the high value and vulnerability of medical data.In view of the current situation,this thesis proposes a blockchain-based Medical data sharing system to solve the above problems.The core of this system mainly adopts the Hyperledger Fabric alliance chain framework and combines with the IPFS interplanetary storage file system to form a storage mode of "index on chain,storage off chain".This model stores the index information of electronic medical records on the blockchain and encrypts them with the user’s public key.Because it is stored on the chain,the index has the characteristics of secure decentralized storage,tamper-proof and traceability,etc.In addition,the model uses IPFS distributed storage technology to effectively reduce the communication and storage pressure of the blockchain system by storing the ciphertext of the medical records under the chain.At the same time,in order to realize the secure sharing of electronic medical records,the user grants the decryption authority to other users through the proxy re-encryption algorithm,and only authorized users can decrypt the ciphertext of the medical record to ensure the safe and credible sharing of the medical record.According to the concrete realization of the system,this thesis gives the system test plan,and carries on the function test and the system test to the system,and finally analyzes the test results and the safety of the system to confirm that the system achieves the expected effect.更多还原