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Privacy-Preserving Searchable Encryption Scheme Based on Public and private blockchains

Tsinghua Science and Technology 2023年第1期28卷 13-26页

作者： Ruizhong Du Caixia Ma Mingyue Li School of Cyberspace Security and Computer and Hebei Province Key Laboratory of High Confidence Information SystemHebei UniversityBaoding 071002China College of Cyber Science Nankai UniversityTianjin 300350China

While users enjoy the convenience of data outsourcing in the cloud,they also face the risks of data modification and private information *** encryption technology can perform keyword searches over encrypted data while protecting their privacy and guaranteeing the integrity of the data by verifying the search ***,some associated problems are still encountered,such as the low efficiency of verification and uncontrollable query ***,this paper proposes a Privacy-Preserving Searchable Encryption(PPSE)scheme based on public and private ***,we store an encrypted index in a private blockchain while outsourcing corresponding encrypted documents to a public *** encrypted documents are located through the encrypted *** method can reduce the storage overhead on the blockchains,and improve the efficiency of transaction execution and the security of stored ***,we adopt a smart contract to introduce a secondary verification access control mechanism and restrict data users’access to the private blockchain through authorization for the purpose of guaranteeing data privacy and the correctness of access control ***,the security analysis and experimental results indicate that compared with existing schemes,the proposed scheme can not only improve the security of encrypted data but also guarantee the efficiency of the query.

关键词： private blockchain public blockchain access control forward privacy backward privacy

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blockchain for Education:Verification and Management of Lifelong Learning Data

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Computer Systems Science & Engineering 2022年第11期43卷 591-604页

作者： Ba-Lam Do Van-Thanh Nguyen Hoang-Nam Dinh Thanh-Chung Dao BinhMinh Nguyen School of Information and Communication Technology Hanoi University of Science and TechnologyHanoiVietnam

In recent years,blockchain technology has been applied in the educational domain because of its salient advantages,i.e.,transparency,decentralization,and *** systems typically use public blockchain networks such as Ethereum and Bitcoin to store learning ***,the cost of writing data on these networks is significant,making educational institutions limit data sent to the target network,typically containing only hash codes of the issued *** this paper,we present a system based on a private blockchain network for lifelong learning data authentication and management named B4E(blockchain For Education).B4E stores not only certificates but also learners’training data such as transcripts and educational programs in order to create a complete record of the lifelong education of each user and verify certificates that they have *** a result,B4E can address two types of fake certificates,i.e.,certificates printed by unlawful organizations and certificates issued by educational institutions for learners who have not met the training *** addition,B4E is designed to allow all participants to easily deploy software packages to manage,share,and check stored information without depending on a single point of *** such,the system enhances the transparency and reliability of the stored *** experiments show that B4E meets expectations for deployment in reality.

关键词： Training data certificate verification and management private blockchain

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