Blockchain-based multi-hop permission delegation scheme with controllable delegation depth for electronic health record sharing  

作　　者：Ya Gao Aiqing Zhang Shu Wu Jindou Chen 

机构地区：[1]School of Physics and Electronic Information,Anhui Normal Univresity,Wuhu 241002,China [2]Anhui Provincial Engineering Laboratory on Information Fusion and Control of Intelligent Rabot,Wuhu 241002,China

出　　处：《High-Confidence Computing》2022年第4期14-22,共9页高置信计算（英文）

基　　金：supported by the National Natural Science Foundation of China(No.62072005);Natural Science Foundation of Anhui Province,China(No.2108085Y22);Anhui Provincial Engineering Laboratory on Information Fusion and Control of Intelligent Rabot,China(No.IFCIR2020008).

摘　　要：Permission delegation has become a new way for data sharing by delegating the authorized permission to other users.A flexible authorization model with strict access control policies is promising for electronic health record(EHR)sharing with security.In this paper,a blockchain-based multi-hop permission delegation scheme with controllable delegation depth for EHR sharing has been presented.We use the interplanetary file system(IPFS)for storing the original EHRs.Smart contracts and proxy re-encryption technology are implemented for permission delegation.In order to ensure data security,we use attribute-based encryption to provide fine-grained access control.Additionally,blockchain is used to achieve traceability and immutability.We deploy smart contracts so that the delegation depth can be set by delegators.Security analysis of the proposed protocol shows that our solution meets the designed goals.Finally,we evaluate the proposed algorithm and implement the scheme on the Ethereum test chain.Our scheme outperforms the competition in terms of performance,according to the results of our experiments.

关 键 词：Blockchain Data security Permission delegation Access control Smart contract 

分 类 号：TP311.13[自动化与计算机技术—计算机软件与理论]