| The widespread application of the internet of things(Io T)technology in medical field has greatly promoted the development of global medical and health informatization industry,thus expediting the establishment of human health community.In this case,all kinds of medical data have shown explosive growth,and people have a higher and more urgent requirement for the management and privacy protection of personal health and medical information.However,traditional medical information systems are independent from each other,lacking integration and sharing mechanisms for medical data,which cannot meet the needs of medical services at this stage.Existing solutions are to migrate huge medical data to the cloud platform to realize data exchange and sharing among medical-related institutions through cloud computing and cryptography technologies,but this process is prone to personal privacy leakage and data abuse due to attacks by malicious attackers,single point of failure of data centers,or lack of defense,etc.,which not only puts people’s information in danger,but also adds difficulties on regulatory authorities.Therefore,it has already become an important research topic to obtain the effective control of the privacy security and supervision,and building the reliable and safe sharing mechanism during the flow of medical data in the field of intelligent medical care.Blockchain is a new computer application model that has incorporated the technologies of peerto-peer transmission,consensus mechanism,cryptography,smart contracts,and distributed data storage.Equipped with decentralized,highly trusted and unforgeable characteristics,the blockchain offers a solution for the existing cloud-based Io T smart medical data management platform.To address these issues,a blockchain-based “cloud-edge-end” collaborative medical data security sharing scheme is put forward in this thesis.Specifically,the designed system model involves three data-related subjects,namely,users,hospitals or healthcare companies and research institutions.Firstly,considering the problems of limited computing resources on the user side,transferring some computing tasks to the edge servers for execution is achievable.Then,to prevent incomplete or erroneous data returned from the cloud,the solution coupling interplanetary file system and blockchain technology is able to fulfil the reliable data storage and retrieval functions,thus ensuring that the third-party research institutions obtain complete and reliable data sets for training data and software upgrades,etc.Security analysis and performance comparison experiments are conducted for this scheme.The results show that the scheme outperforms the traditional one in terms of efficiency,and more security features are found.Moreover,erroneous medical data generated by misdiagnosis or device failure cannot be altered once it is on the chain,but users,actually,have the rights to operate on their personal medical data.In this circumstance,a blockchain-based supervisory scheme for medical data is proposed.By employing editable blockchain technology,the supervisory authority can effectively manage the medical data on the chain.Hence,the modification and deletion of erroneous and malicious data can be achieved while maintaining the tamper-evident characteristics of the blockchain subject.Medical data is encrypted and uploaded for the data security,and flexible access control is designed so that the data acquirers such as doctors must meet the access policy of ciphertext data before decrypting.In the end,the feasibility of the scheme is verified by building a blockchain-based supervision platform for medical data.In conclusion,the medical data security sharing and supervision scheme are introduced in the context of smart healthcare.And simulation experiments as well as system implementation are carried out respectively.So,it is an innovative and achievable program,which provides theoretical and practical values for future applications. |
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