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AudiTEE: Efficient, General-Purpose and Privacy-Preserving Audit for distributed ledgers

Journal of Computer and Communications 2021年第8期9卷 103-120页

作者： Zhufeng Ye Zhenghao Wu Xianglan Tian College of Cyber Security Jinan University Guangzhou China

Privacy-preservation and effective auditing are two desirable but challenging requirements on distributed ledgers. To meet the requirements, this paper presents an auditing scheme, called as AudiTEE, which can audit a distributed ledger in a generic, efficient, and privacy-preserving manner. AudiTEE leverages Trusted Execution Environment (TEE) to generate confidential but auditable transactions and realize arbitrary, efficient and confidential audit on them. Unfortunately, TEE suffers from some inherent barriers and is itself not a complete solution for fast audit. To tackle these challenges, AudiTEE takes advantage of KAMT (K-anonymity Authentication Based on Merkle Tree) protocol for efficient management on account and user-defined anonymous transactions. Further, to achieve a complete and fast audit with unlinkability, TEE doesn’t process through all but only a comparatively small part of transactions according to a special ktag attached on each transaction to ensure that a user cannot hide transactions from auditor even when auditor is blind with who is involved in each transaction on the ledger. Apart from the above, AudiTEE allows flexible control on user behaviors. We implement a concrete instance of AudiTEE under a bank setting and demonstrate the scalability with all its core functionalities.

关键词： distributed ledgers Trusted Execution Environments Auditing Privacy-Preservation Authentication

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A Study on the Challenges and Solutions of Blockchain Interoperability

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China Communications 2023年第6期20卷 148-165页

作者： Siyu Zhu Cheng Chi Yang Liu China Academy of Information and Communications Technology Beijing 100191China

With the development of blockchain technology,a variety of mutually independent blockchains such as Bitcoin and Ethereum,as well as private and consortium chains,coexist in large *** a linker of the blockchain network,blockchain interoperability will link more blockchain ecosystems,realize the interconnection of the blockchain and enhance the scalability of the *** paper summarizes typical blockchain interoperability ***,it proposes a blockchain interoperability definition and an architecture ***,it analyzes technical characteristics of blockchain interoperability,and typical blockchain interoperability cases are ***,the trend of future development of blockchain interoperability technology is summarized and discussed.

关键词： blockchain interoperability smart contract crosschain distributed ledgers Dapps

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LUCE:A blockchain-based data sharing platform for monitoring data License accoUntability and CompliancE

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Blockchain(Research and Applications) 2022年第4期3卷 123-132页

作者： Visara Urovi Vikas Jaiman Arno Angerer Michel Dumontier Institute of Data Science(IDS) Maastricht University6200 MD Maastrichtthe Netherlands School of Business and Economics Maastricht University6200 MD Maastrichtthe Netherlands

Easy access to data is one of the main avenues to accelerate scientific *** a key element of scientific innovations,data sharing allows the reproduction of results and helps prevent data fabrication,falsification,and *** the research benefits from data reuse are widely acknowledged,the data collections existing today are still kept in ***,monitoring what happens to data once they have been handed to a third party is currently not feasible within the current data sharing *** propose a blockchain-based system to trace data collections and potentially create a more trustworthy data sharing *** this paper,we present the LUCE(License accoUntability and CompliancE)architecture as a decentralized blockchain-based platform supporting data sharing and *** is designed to provide full transparency on what happens to the data after they are shared with third *** contributions of this work consist of i)the design of a decentralized data sharing solution with accountability and compliance by design and ii)the inclusion of a dynamic consent model for personalized data sharing preferences and for enabling legal compliance *** test the scalability of the platform in a real-time environment where a growing number of users access and reuse different *** to existing data sharing solutions,LUCE provides transparency over data sharing practices,enables data reuse,and supports regulatory *** experimentation shows that the platform can be scaled for a large number of users.

关键词： Blockchain distributed ledgers Data sharing Data reuse Dataset tracking GDPR

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A systematic literature review of the tension between the GDPR and public blockchain systems

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Blockchain(Research and Applications) 2023年第2期4卷 113-135页

作者： Rahime Belen-Saglam Enes Altuncu Yang Lu Shujun Li Institute of Cyber Security for Society(ICSS)&School of Computing University of KentKeynes CollegeCanterburyCT27NPUnited Kingdom School of Science Technology and Health YorkSt John UniversityLord Mayor's WalkYorkYO317EXUnited Kingdom

Blockchain technology has been rapidly growing since Bitcoin was invented in *** most common type of blockchain system,public(permissionless)blockchain system,has some unique features that lead to a tension with the European Union’s General Data Protection Regulation(GDPR)and other similar data protection *** this paper,we report the results of a systematic literature review(SLR)on 114 research papers discussing and/or addressing such a *** the best of our knowledge,our SLR is the most comprehensive review of this tension,leading to a more in-depth and broader analysis of related research work on this important *** results revealed three main types of issues:(i)difficulties in exercising data subjects’rights such as the‘right to be forgotten’(RTBF)due to the immutable nature of public blockchains;(ii)difficulties in identifying roles and responsibilities in the public blockchain data processing ecosystem(particularly on the identification of data controllers and data processors);and(iii)ambiguities regarding the application of the relevant law(s)due to the distributed nature of *** work also led to a better understanding of solutions for improving the GDPR compliance of public blockchain *** can help inform not only blockchain researchers and developers but also policymakers and law markers to consider how to reconcile the tension between public blockchain systems and data protection laws(the GDPR and beyond).

关键词： Blockchain distributed ledgers Privacy Data protection law Legal compliance GDPR EU EEA UK

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