区块链技术在电子病历共享的应用研究

doi:10.19665/j.issn1001-2400.2020.05.014

Abstract

Abstract:

Electronic health records contain the occurrence, development and treatment of patients' diseases, and have a high medical value. Due to the privacy and sensitivity of medical data, data sharing and privacy protection are key issues for electronic medical records. Aiming at the characteristics of decentralization and tamper resistance of the blockchain, an electronic medical record sharing model based on the blockchain is proposed. First, a private chain and an alliance chain are built to store the encrypted electronic medical and electronic medical's security index records of users, respectively. Second, a combination of distributed key generation technology and a type and identity based proxy re-encryption scheme is proposed, and a multi-center scheme is designed as a data sharing protocol, which uses the entrusted-proof-of-rights-and-interests algorithm to select proxy nodes. Finally, an analysis and calculation of the proposed scheme and the existing scheme in various aspects such as tamper resistance and attack resistance are conducted. The result shows that the scheme consumes less energy in terms of communication overhead and computing power so that it can achieve the safe sharing of medical data effectively.

Key words: electronic medical record, data sharing, distributed key generation, blockchain, proxy re-encryption

CLC Number:

R197.323

ZHAI Sheping,WANG Yijing,CHEN Siji. Research on the application of blockchain technology in the sharing of electronic medical records[J].Journal of Xidian University, 2020, 47(5): 103-112.

Figures/Tables 8

阶段	笔者提出的方案	文献[19]
数据存储	$2 n + 4 G 1$ + $G τ$ + $Q$ + $σ$ +32	$n + 6 G 1$ + $G τ$ +3 $Q$ +59
索引存储	$n + 2 G 1$ +n $G τ$ + $σ$ +32 B	8 $n + 6 G 1 + G τ + 3 Q$ +90
关键字搜索	2 $G 1$ + $G τ$	6 $G 1$ +2 $Q$
数据访问	4 $G 1$ +2 $G τ$ +2 $Q$ +64	32

References 19

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文献	F1	F2	F3	F4	F5
[10]	达到要求	Improve DPoS	未达到要求	未达到要求	Big
[11]	未达到要求	PoW	未达到要求	达到要求	Big
[19]	达到要求	DBPT	未达到要求	达到要求	Big
文中	达到要求	DPoS	达到要求	达到要求	Small

交易		长度/bytes	最长时间/ms	最短时间/ms	平均时间/ms	Gas消耗/wei
T_x₁	n=20	7 436	698	409	557	2 508 234
	n=50	22 387	1 654	1 327	1 465	5 648 632
	n=100	49 635	3 786	3 476	3 667	11 067 458
T_x₂		3 087	245	192	203	574 905

Research on the application of blockchain technology in the sharing of electronic medical records

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