支持受控共享的医疗数据隐私保护方案

doi:10.19665/j.issn1001-2400.20230104

Abstract

Abstract:

The rational use of patient medical and health data information has promoted the development of medical research institutions.Aiming at the current difficulties in sharing medical data between patients and medical research institutions,data privacy is easy to leak,and the use of medical data is uncontrollable,a medical data privacy protection scheme supporting controlled sharing is proposed.Firstly,the blockchain and proxy server are combined to design a medical data controlled sharing model that the blockchain miner nodes are distributed to construct proxy re-encryption keys,and the proxy server is used to store and convert medical data ciphertext,and proxy re-encryption technology is used to bring about the secure sharing of medical data while protecting the privacy of patients.Secondly,a dynamic adjustment mechanism of user permissions is designed that the patient and the blockchain authorization management nodes update the access permissions of medical data through the authorization list to realize the controllable sharing of medical data by patients.Finally,the security analysis shows that the proposed scheme can bring about the dynamic sharing of medical data while protecting the privacy of medical data,and can also resist collusion attacks.Performance analysis shows that this scheme has advantages in communication overhead and computing overhead,and is suitable for controlled data sharing between patients or hospitals and research institutions.

Key words: blockchain, medical data, controlled sharing, proxy re-encryption, privacy protection

CLC Number:

TP309

GUO Qing, TIAN Youliang. Medicaldata privacy protection scheme supporting controlled sharing[J].Journal of Xidian University, 2024, 51(1): 165-176.

Figures/Tables 10

阶段	文中方案	文献[17]方案
系统初始化	\|G₁\|+\| $Z p *$ \|	5\|G₁\|+4\| $Z p *$ \|
数据存储	3\|G₁\|+\|G₂\|+l	2\|G₁\|+2\|G₂\|
数据访问	3\|G₁\|+\|G₂\|+l	\|G₁\|+2\|G₂\|

References 23

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数据拥有者	医疗数据类型	研究机构
数据拥有者	医疗数据类型	研究机构R_a	研究机构R_b	研究机构R_c
患者P_i	基础医疗数据	可见	不可见	可见
	敏感医疗数据	可见	不可见	不可见
医院H_n	基础医疗数据	可见	可见	不可见
	敏感医疗数据	不可见	可见	不可见

方案	区块链	隐私保护	访问控制	数据防篡改	代理重加密	授权更新
文献[22]	×	√	√	×	√	×
文献[23]	√	√	√	×	×	×
文献[15]	√	√	√	×	×	×
文献[17]	√	√	√	√	√	×
文中方案	√	√	√	√	√	√

阶段	文中方案	文献[17]方案
初始加密	T_P+3T_E	2T_P+4T_E
重加密密钥构造	3T_E	3T_E
重加密	T_P+2T_E	T_P+3T_E
解密	T_P+T_E	T_P+2T_E

Medicaldata privacy protection scheme supporting controlled sharing

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