Abstract
The current medical cyber physical systems involve a wide range of institutions and a large number of participants. Data sharing among distributed medical institutions is already a development trend. However, the security is worrying; e.g., the access to medical data lacks uniformity and standardization. What is more, data is easy to be tampered with and leaked. This has a very negative impact on the medical industry. Therefore, a strict and reliable access control mechanism for data in the medical cyber physical systems is a prerequisite for ensuring the implementation of modern medical functions. We deal with how to design effective access control in medical cyber physical systems. Combined with blockchain technology, we design the medical cyber physical systems based on blockchain data access control mechanism and unite data in the chain of union Fabric network resources access control. We qualitatively classify medical data, define the weight level of different data, design a medical data access framework based on blockchain, build an applicable model, formulate access control strategy, and specify the role assignment and access task matching of users, so as to achieve secure and effective data access control. The Hyperledger Fabric network is established as the alliance chain for managing access control rights distribution through smart contracts so as to achieve case-based medical data access control under the blockchain.
Highlights
Medical cyber physical systems (MCPS) [1] are involved in various medical institutions, government health management departments, and other medical or health institutions and the important part of smart IoT healthcare [2]
To ensure the security of medical data and the privacy of patients is a necessary mechanism for MCPS. e mandatory implementation of access control for all users can stipulate that users can only access the specified resources, which is conducive to the standardized management of medical data access
In order to take into account the heterogeneity of medical data and reduce the cost and complexity of medical informatization, the concept of attribute is used in the experiment to manage it uniformly. e premise of access control is identity authentication, and the foundation is certificate mechanism. ere are three types of certificates in Fabric, such as Enrollment Certificate (ECert), Transaction Certificate (TCert), and TLS Certificate (TLSCert) used to guarantee the transmission security of communication link. e default signature algorithm of certificate is ECDSA, and the hash algorithm is SHA-256
Summary
Medical cyber physical systems (MCPS) [1] are involved in various medical institutions, government health management departments, and other medical or health institutions and the important part of smart IoT healthcare [2]. In the MCPS, access control is an important means to ensure the security of medical data Traceability and lossless modification of blockchain can improve the credibility of access control mechanism Because it is difficult for the current public chain to meet the requirements of high throughput, low energy consumption, and privacy protection, the alliance chain with higher potential in performance, privacy protection, and permission control is suitable for the blockchain in the medical environment.
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