Sealed-bid auctions are a vital transaction tool in the e-commerce field.Traditional centralized auction schemes typically result in severe threats to data integrity,information transparency,and traceability owing to ...Sealed-bid auctions are a vital transaction tool in the e-commerce field.Traditional centralized auction schemes typically result in severe threats to data integrity,information transparency,and traceability owing to their excessive reliance on third parties,and blockchain-based auction schemes generally suffer from high storage costs and are deficient in functional and architectural design.To solve these problems,this study presents a sealed-bid auction scheme that removes the third-party based on an Ethereum smart contract,ensuring data integrity,openness,and transparency in the execution process.The commitment mechanism and distributed storage system help to significantly reduce the user’s storage cost and protect the privacy of user bids.For the functional design,this study introduces a fulltext-retrieval and dispute-processing module for commodities,which reduces the defects existing in the functional module design of existing auction systems.Furthermore,a prototype auction system on the Ethereum test chain is built to validate the proposed scheme.Experiments show that compared with traditional storage methods,indirect storage based on a distributed storage system of texts and images can reduce the storage cost by at least 50%while ensuring data integrity.Finally,the gas cost at each stage of the auction scheme and the time required for the full-text retrieval of products are recorded to evaluate the scheme performance and analyze the test results.展开更多
针对现有用户协作算法存在共谋攻击、背景知识攻击以及用户协作意愿等问题,基于可验证秘密共享与智能合约提出了一种用户协作隐私保护算法(privacy protection algorithm based on verifiable secret sharing and smart contracts,VSS-S...针对现有用户协作算法存在共谋攻击、背景知识攻击以及用户协作意愿等问题,基于可验证秘密共享与智能合约提出了一种用户协作隐私保护算法(privacy protection algorithm based on verifiable secret sharing and smart contracts,VSS-SCPPA)。该算法首先利用可验证秘密共享算法对用户查询信息进行加密和分裂,并提供系数承诺以验证子秘密数据的完整性。其次,结合智能合约与差分隐私技术设计了一种用户选择算法,构建匿名集。对该算法在抵御串通攻击方面的有效性进行了分析。通过在Geolife与BerlinMOD数据集上的实验,结果显示VSS-SCPPA的隐私保护性更高。与Tr-privacy、Ik-anonymity和GCS相比,VSS-SCPPA的效率分别提高了约86.34%、99.27%和99.19%。VSS-SCPPA在提高隐私保护性的同时显著提升了算法效率,证明了其在用户协作隐私保护中的有效性。展开更多
基金National Natural Science Foundation of China(62173066)Open Project of Sichuan Provincial Key Laboratory of Intelligent Terminal Co-built by Province and City(SCITLAB-1014)。
文摘Sealed-bid auctions are a vital transaction tool in the e-commerce field.Traditional centralized auction schemes typically result in severe threats to data integrity,information transparency,and traceability owing to their excessive reliance on third parties,and blockchain-based auction schemes generally suffer from high storage costs and are deficient in functional and architectural design.To solve these problems,this study presents a sealed-bid auction scheme that removes the third-party based on an Ethereum smart contract,ensuring data integrity,openness,and transparency in the execution process.The commitment mechanism and distributed storage system help to significantly reduce the user’s storage cost and protect the privacy of user bids.For the functional design,this study introduces a fulltext-retrieval and dispute-processing module for commodities,which reduces the defects existing in the functional module design of existing auction systems.Furthermore,a prototype auction system on the Ethereum test chain is built to validate the proposed scheme.Experiments show that compared with traditional storage methods,indirect storage based on a distributed storage system of texts and images can reduce the storage cost by at least 50%while ensuring data integrity.Finally,the gas cost at each stage of the auction scheme and the time required for the full-text retrieval of products are recorded to evaluate the scheme performance and analyze the test results.
文摘针对现有用户协作算法存在共谋攻击、背景知识攻击以及用户协作意愿等问题,基于可验证秘密共享与智能合约提出了一种用户协作隐私保护算法(privacy protection algorithm based on verifiable secret sharing and smart contracts,VSS-SCPPA)。该算法首先利用可验证秘密共享算法对用户查询信息进行加密和分裂,并提供系数承诺以验证子秘密数据的完整性。其次,结合智能合约与差分隐私技术设计了一种用户选择算法,构建匿名集。对该算法在抵御串通攻击方面的有效性进行了分析。通过在Geolife与BerlinMOD数据集上的实验,结果显示VSS-SCPPA的隐私保护性更高。与Tr-privacy、Ik-anonymity和GCS相比,VSS-SCPPA的效率分别提高了约86.34%、99.27%和99.19%。VSS-SCPPA在提高隐私保护性的同时显著提升了算法效率,证明了其在用户协作隐私保护中的有效性。
