2023年5月JournalonCommunicationsMay2023第44卷第5期通信学报Vol.44No.5基于本地化差分隐私和属性基可搜索加密的区块链数据共享方案冯涛，陈李秋，方君丽，石建明（兰州理工大学计算机与通信学院，甘肃兰州730050）摘要：针对传统基于云的数据共享方案依赖可信第三方、只关注数据隐私保护或访问控制问题，提出一种基于本地化差分隐私和属性基可搜索加密的区块链数据共享方案。将区块链和云服务器结合，链上链下协同存储数据，提供高效可靠防篡改的数据共享。首先，引入本地化差分隐私对共享数据进行预处理，保证数据拥有者身份隐私的同时抵御不可信第三方攻击；其次，将可搜索加密技术和属性基加密结合，支持密文检索实现数据隐私保护、为共享数据提供细粒度访问控制；最后，通过安全性、正确性证明及实验分析证明所提方案满足安全目标。关键词：区块链；本地化差分隐私；数据共享；属性基可搜索加密；隐私保护中图分类号：TP309文献标志码：ADOI:10.11959/j.issn.1000−436x.2023103Blockchaindatasharingschemebasedonlocalizeddifferenceprivacyandattribute-basedsearchableencryptionFENGTao,CHENLiqiu,FANGJunli,SHIJianmingSchoolofComputerandCommunication,LanzhouUniversityofTechnology,Lanzhou730050,ChinaAbstract:Aimingattheproblemthattraditionalcloud-baseddatasharingschemesrelyontrustedthirdpartiesandonlyfocusondataprivacyprotectionoraccesscontrol,ablockchaindatasharingschemebasedonlocalizeddiffer-enceprivacyandattribute-basedsearchableencryptionwasproposed.Theblockchainandcloudserverwerecombinedtostoredatachainbychainandprovideefficient,reliableandtamper-proofdatasharing.Firstly,thelocalizationdif-ferenceprivacywasintroducedtopreprocesstheshareddatatoprotecttheprivacyofthedataownerandresisttheat-tackoftheuntrustedthirdparty.Secondly,thesearchableencryptiontechnologyandattribute-basedencryptionwerecombinedtorealizedataprivacyprotection,supportciphertextretrieval,andprovidefine-grainedaccesscontrolforshareddata.Finally,thesafety,thecorrectnessproof,andtheexperimentalanalysisprovesthattheproposedschememeetsthesafetyobjectives.Keywords:blockchain,localizeddifferentialprivacy,datasharing,attribute-basedsearchableencryption,privacyprotection0引言...
