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  

Blockchain data sharing scheme based on localized difference privacy and attribute-based searchable encryption

作　　者：冯涛[1] 陈李秋 方君丽[1] 石建明 FENG Tao;CHEN Liqiu;FANG Junli;SHI Jianming(School of Computer and Communication,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学计算机与通信学院,甘肃兰州730050

出　　处：《通信学报》2023年第5期224-233,共10页Journal on Communications

基　　金：国家自然科学基金资助项目(No.62162039,No.61762060);甘肃省科技厅重点研发计划基金资助项目(No.20YF3GA016)。

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。Aiming at the problem that traditional cloud-based data sharing schemes rely on trusted third parties and only focus on data privacy protection or access control,a blockchain data sharing scheme based on localized difference privacy and attribute-based searchable encryption was proposed.The blockchain and cloud server were combined to store data chain by chain and provide efficient,reliable and tamper-proof data sharing.Firstly,the localization difference privacy was introduced to preprocess the shared data to protect the privacy of the data owner and resist the attack of the untrusted third party.Secondly,the searchable encryption technology and attribute-based encryption were combined to realize data privacy protection,support ciphertext retrieval,and provide fine-grained access control for shared data.Finally,the safety,the correctness proof,and the experimental analysis proves that the proposed scheme meets the safety objectives.

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 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]