基于区块链的分布式EHR细粒度可追溯方案

doi:10.11959/j.issn.1000-436x.2021033

Abstract

Abstract:

Aiming at the key management of electronic health records (EHR) in a distributed system and user identity tracing issues, a distributed EHR fine-grained traceability scheme based on blockchain was proposed.Combining chameleon hash and zero-knowledge proof technology, the registration of nodes on the blockchain and the generation of identity certificates were realized, and the traceability of malicious users on the blockchain was realized.Besides, given the single point of failure problem of key management, the attribute-based encryption scheme of distributed ciphertext strategy was designed to achieve secure and fine-grained data access control, and multiple decryption agency blockchain nodes were set up to jointly distribute the attribute private keys of user nodes.The security analysis shows that the traceable distributed key generation attribute-based encryption algorithm based on the blockchain is adaptively secure under the random oracle model, and through experiments, the feasibility and practicability of the proposed scheme are shown.

Key words: EHR, blockchain, tracking, key management, fine-grained access control

CLC Number:

TP309

Zuobin YING, Yuanping SI, Jianfeng MA, Ximeng LIU. Blockchain-based distributed EHR fine-grained traceability scheme[J]. Journal on Communications, 2021, 42(5): 205-215.

Figures/Tables 11

参数	含义
λ/MSK	安全参数/主密钥
pp/GP	公共参数/全局参数
$A_{i} / {PK}_{A_{i}} / {PK}_{{att}_{j}}$	解密机构/对应的公钥/属性公钥
u_id / regmess	用户节点的真实身份/节点的注册信息
(conf,pers)	节点的公开和保密信息对
pk_chame,sk_chame	变色龙哈希的公私钥对
${cert}_{u_{i d}}$	节点的身份证明
$(M, ρ)$	访问策略

阶段	通信开销
用户节点数据加密	$3 \| S \| \times \| G_{1} \| + \| G_{2} \|$
访问授权与解密	$3 \| S_{{sk}_{u}} \| \times \| G_{1} \|$

References 30

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功能	安全	隐私	用户认证	密钥管理	可追溯
文献[15]方案	√	√	√	×	数据追溯
文献[29]方案	√	√	×	×	数据追溯
文献[30]方案	√	√	×	×	×
本文方案	√	√	√	DKG	ID追溯

Merkle树深度	pk_mess/KB	vk_mess/B	pk_cert/MB	vk_cert/KB	?_cert/B	?_mess/B
10	663	665	103	11	341	341
20	663	665	171	11	341	341
30	663	665	237	11	341	341

Blockchain-based distributed EHR fine-grained traceability scheme

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