Blockchain-Based Privacy-Preserving Public Auditing for Group Shared Data  

作　　者：Yining Qi Yubo Luo Yongfeng Huang Xing Li 

机构地区：[1]Tsinghua University,Beijing,100084,China [2]Beijing National Research Center for Information Science and Technology,Beijing,100084,China [3]University of North Carolina at Chapel Hill,North Carolina,27599,USA

出　　处：《Intelligent Automation & Soft Computing》2023年第3期2603-2618,共16页智能自动化与软计算（英文）

基　　金：supported by the National Key Research and Development Program of China(No.2018YFC1604002);the National Natural Science Foundation of China(No.U1836204,No.U1936208,No.U1936216,No.62002197).

摘　　要：Cloud storage has been widely used to team work or cooperation devel-opment.Data owners set up groups,generating and uploading their data to cloud storage,while other users in the groups download and make use of it,which is called group data sharing.As all kinds of cloud service,data group sharing also suffers from hardware/software failures and human errors.Provable Data Posses-sion(PDP)schemes are proposed to check the integrity of data stored in cloud without downloading.However,there are still some unmet needs lying in auditing group shared data.Researchers propose four issues necessary for a secure group shared data auditing:public verification,identity privacy,collusion attack resis-tance and traceability.However,none of the published work has succeeded in achieving all of these properties so far.In this paper,we propose a novel block-chain-based ring signature PDP scheme for group shared data,with an instance deployed on a cloud server.We design a linkable ring signature method called Linkable Homomorphic Authenticable Ring Signature(LHARS)to implement public anonymous auditing for group data.We also build smart contracts to resist collusion attack in group auditing.The security analysis and performance evalua-tion prove that our scheme is both secure and efficient.

关 键 词：Provable data possession data integrity blockchain ring signature 

分 类 号：TP311.13[自动化与计算机技术—计算机软件与理论]