基于联盟链的可搜索加密电子病历数据共享方案

doi:10.11959/j.issn.1000-436x.2020116

Abstract

Abstract:

Considering that it was difficult to share medical record data among different medical institutions in cloud storage,an electronic medical record data sharing scheme based on searchable encryption on blockchain was proposed.In order to realize the secure storage and sharing of electronic medical records in the scheme,the patient’s electronic medical record ciphertext was stored in the hospital server,the ciphertext hash value was stored in the private blockchain,and the keyword index was stored in the consortium blockchain.Searchable encryption was used to implement secure search of keywords in the consortium blockchain,and proxy re-encryption technology was used to realize the sharing of electronic medical records of patients by other data users.Security analysis shows that the proposed scheme can achieve ciphertext security and keyword security.Moreover,the performance of the scheme was analyzed by function analysis,computational efficiency analysis and numerical simulation.The performance analysis shows that the scheme can achieve high computational efficiency.

Key words: blockchain, electronic medical record, searchable encryption, proxy re-encryption, data sharing

CLC Number:

TP309.7

Shufen NIU,Wenke LIU,Lixia CHEN,Caifen WANG,Xiaoni DU. Electronic medical record data sharing scheme based on searchable encryption via consortium blockchain[J]. Journal on Communications, 2020, 41(8): 204-214.

Figures/Tables 7

References 22

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病历生成者ID	病历拥有者ID	病历关键字索引	病历密文哈希值
ID_d	ID_a	(c_a1,c_a2)	hash(c_{a 0})

区块生成者ID	安全索引
ID_h	Tx _a=(ID_b,ID_a,c_{a 1})

方案	区块链	访问控制	隐私保护	安全搜索	身份认证
文献[12]	×	√	√	√	×
文献[19]	×	√	√	√	√
文献[20]	√	√	√	×	×
文献[21]	√	√	√	√	×
本文方案	√	√	√	√	√

符号	描述	执行时间/ms
T_e	指数运算时间	4.888
T_p	双线性配对运算时间	5.021
T_h	一般哈希函数运算时间	12.573
T_H	哈希到点运算时间	0.008

方案	加密阶段/ms	搜索阶段/ms	解密阶段/ms
文献[12]	3T_e+T_p+T_h=32.258	2T_e+T_h=22.349	T_e+2 T_p=14.93
文献[22]	T_e+2T_h+4T_H=30.066	3T_p+2T_h=40.209	T_e+4T_p+T_h+2T_H=24.996
本文方案	3T_e+T_p+4T_H=19.717	T_e+2T_p+2T_H=14.946	T_e+T_p+T_H=9.917

Electronic medical record data sharing scheme based on searchable encryption via consortium blockchain

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Figures/Tables 7

References 22

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关键字数量	系统构建/ms	数据加密/ms	私有链验证/ms	联盟链验证/ms	陷门生成/ms	关键字搜索/ms	数据解密/ms
n=10	37	309	15	226	92	148	1
n=50	37	1 455	15	1 155	457	744	1
n=100	37	2 977	15	2 319	903	1 456	1

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