With the features of decentralization and trustlessness and through distributed data storage, point-to-point transmission, and encryption algorithms, blockchain has shed new light on the security and protection of medical data, and it can resolve the contradiction between data sharing and privacy protection with proper security strategies. In this paper, we integrate the strengths of both blockchain and cloud computing and build the privacy protection scheme for medical data based on blockchain and cloud computing. This scheme introduces cloud computing and provides services to blockchain nodes with cloud server computing; meanwhile, it collects, analyzes, processes, and maintains medical data in the identity authentication interface and solves the insufficient computing abilities of some nodes in blockchain so as to verify the authenticity and reliability of data. The simulation experiment proves that the proposed scheme is effective. It can achieve the secure protection and integrity verification of medical data and address the problems of high computing complexity, data sharing, and privacy protection.

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The current privacy protection scheme of medical electronic health records ignores the security of role interaction, which leads to low security of medical electronic health record data and a long time for data encryption and decryption. This paper proposes a privacy protection method of medical electronic health records based on blockchain and asymmetric encryption. This paper uses blockchain technology and asymmetric encryption algorithm to establish an electronic health record system model, selects the alliance chain to control the permissions of alliance members, constructs the corresponding sub key, uses shared users for information interaction, obtains the file key through verification (so as to decrypt the data and obtain the shared data plain text), and realizes medical electronic health through the privacy and protection scheme process of health records. Experimental results show that the data security of the proposed method is as high as 92 %, and the encryption and decryption time is only 0.45 s, which can effectively improve the data security and shorten the data encryption and decryption time.

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