共查询到19条相似文献,搜索用时 46 毫秒
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俞陟杰 《电子技术与软件工程》2022,(21):9-13
本文以账户模型为研究对象,简单梳理区块链技术、区块链隐私与零知识证明。进一步分析账户模型下区块链的隐私保护,从相关问题、数据构成、保护方案与安全性分析着手,并大致讨论保护方案,针对账户模型区块链细节与隐私探究,提出攻击预防思路,通过性能检测研究,评估BlockMaze可用性。 相似文献
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作为一种去中心化、不可篡改的分布式账本技术,区块链技术具有天然的安全性和隐私保护优势。在医院数据共享中,区块链可以通过智能合约和加密算法实现高效、安全的数据传输和隐私保护。文中探讨了基于区块链技术的医院数据共享与隐私保护机制,分析了区块链网络的架构及其节点功能,重点研究了其数据共享和隐私保护机制,包括智能合约的应用、同态加密及零知识证明技术在数据隐私保护中的实现。 相似文献
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陈少军 《信息技术与信息化》2020,(8):90-92
文中通过研究传统供应链信息溯源存在的问题提出基于区块链的供应链信息可溯源方法.论文设计了供应链中信息可溯源架构,此架构包括四个层次、分别为应用层、智能合约层、区块链网络层和区块链存储层.研究可溯源应用系统模块间的调用关系,基于以上设计和研究设计了供应链可溯源的智能合约,设计了智能合约溯源结构体以及权限控制合约、数据存储... 相似文献
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威胁情报融合了网络安全、情报学等多方面的知识,合理地利用威胁情报可以判断攻击者的攻击目标、时间等,然后及时地采取相应的防御手段,保护网络环境的安全。但是目前对于威胁情报的利用还存在诸多问题:威胁情报数据规范程度不高;各个机构情报数据集中存储,一方面可能会因为网络攻击造成数据泄露,另一方面各个情报机构间的数据难以共享,用户想要获取情报数据更是困难;另外,各用户间的信任问题也难以得到解决。文章针对上述问题提出一个基于区块链技术的威胁情报共享系统。 相似文献
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宋东翔;马伽洛伦;王怡然;潘俊 《电子技术与软件工程》2022,(11):220-223
本文设计基于区块链的高校数据共享系统,详细描述了数据共享思路、系统架构设计、数据格式优化智能合约算法和用户零知识证明登录流程。通过实验测试,智能合约性能满足用户需求范围。高校共享系统的构建,有效的提升了系统的安全性和高校工作的效率。 相似文献
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基于区块链的数据共享有助于推进跨地域、跨系统、跨主体之间的数据共享,让数据提供方放心、数据监管方省心、数据使用方小心,真正促进数据价值流动,实现数字政府.通过分析现有数据共享政策及应用需求,提出基于区块链的数据共享解决方案,从数据发布、数据共享访问控制、数据评价等多个维度设计智能协议,并对相关协议进行了测试验证,给出了... 相似文献
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针对隐私众包场景下出现的数据验证、匿名作恶检测和跨平台资源交互等需求,该文基于区块链技术,并结合零知识证明与环签名技术,提出一种联盟链架构下的隐私众包方案。该方案依靠零知识证明实现对加密数据的验证,依靠链接可撤销环签名改进方案实现工人身份的可控匿名,引入联盟链架构实现众包实体之间的资源交互。在完成众包完整流程的同时,实现隐私众包所需的数据保护与身份保护。安全性分析表明,该方案具有隐私性、可验证性、可控匿名性与公平性。实验结果验证了方案在效率与性能方面的有效性。 相似文献
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《Digital Communications & Networks》2023,9(1):194-202
The need for a flexible, dynamic, and decentralized energy market has rapidly grown in recent years. As a matter of fact, Industry 4.0 and Smart Grids are pursuing a path of automation of operations to insure all the steps among consumers and producers are getting closer. This leads towards solutions that exploit the paradigm of public blockchain, which represents the best platform to design flat and liquid markets for which providing trust and accountability to mutual interactions becomes crucial. On the other hand, one of the risks arising in this situation is that personal information is exposed to the network, with intolerable threats to privacy. In this paper, we propose a solution for energy trading, based on the blockchain Ethereum and Smart Contracts.The solution aims to be a concrete proposal to satisfy the needs of energy trading in smart grids, including the important feature that no information about the identity of the peers of the network is disclosed in advance. 相似文献
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当前通过深度学习方法进行区块链智能合约分类的方法越来越流行,但基于深度学习的方法往往需要大量的样本标签数据去进行有监督的模型训练,才能达到较高的分类性能。该文针对当前可用智能合约数据集存在数据类别不均衡以及标注数据量过少会导致模型训练困难,分类性能不佳的问题,提出基于双层孪生神经网络的小样本场景下的区块链智能合约分类方法:首先,通过分析智能合约数据特征,构建了可以捕获较长合约数据特征的双层孪生神经网络模型;然后,基于该模型设计了小样本场景下的智能合约训练策略和分类方法。最后,实验结果表明,该文所提方法在小样本场景下的分类性能优于目前最先进的智能合约分类方法,分类准确率达到94.7%,F1值达到94.6%,同时该方法对标签数据的需求更低,仅需同类型其他方法约20%数据量。 相似文献
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Brassard and Crépeau [BCr] introduced a simple technique for producing zero-knowledge proof systems based on blobs. As is to be expected, their implementation rests on an unproven cryptographic assumption, specifically, that it is easy to generate numbers that are difficult to factor. In this paper we present an implementation of blobs based on a different cryptographic assumption, specifically, that it is easy to generate primes p over which it is difficult to compute discrete logarithms. If, in addition, we can produce a generator for Z
p
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, this implementation then has the advantage that it leads to proof systems which are perfect zeroknowledge, rather than only almost perfect zero-knowledge.The relationship between factoring and finding discrete logarithms is not well understood, although Bach [Bac1] is an important contribution. Given our current state of number theoretic knowlege, there is no reason to prefer the cryptographic assumption required by one of these implementations over that required by the other. In any event, we introduce the notion of a product blob, whose favorable properties depend only on at least one of these assumptions holding.The first author was supported in part by NSA Grant MDA 904-84-H-00171. The second author was supported in part by NSF Grant DCR-8602562. 相似文献
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《Digital Communications & Networks》2022,8(6):964-975
Smart contract has been the core of blockchain systems and other blockchain-based systems since Blockchain 2.0. Various operations on blockchain are performed through the invocation and execution of smart contracts. This leads to extensive combinations between blockchain, smart contract, Internet of Things (IoT) and Cyber-Physical System (CPS) applications, and then many blockchain-based IoT or CPS applications emerge to provide multiple benefits to the economy and society. In this case, obtaining a better understanding of smart contracts will contribute to the easier operation, higher efficiency and stronger security of those blockchain-based systems and applications. Many existing studies on smart contract analysis are based on similarity calculation and smart contract classification. However, smart contract is a piece of code with special characteristics and most of smart contracts are stored without any category labels, which leads to difficulties of smart contract classification. As the back end of a blockchain-based Decentralized Application (DApp) is one or several smart contracts, DApps with labeled categories and open source codes are applied to achieve a supervised smart contract classification. A three-phase approach is proposed to categorize DApps based on various data features. In this approach, 5,659 DApps with smart contract source codes and pre-tagged categories are first obtained based on massive collected DApps and smart contracts from Ethereum, State of the DApps and DappRadar. Then feature extraction and construction methods are designed to form multi-feature vectors that could present the major characteristics of DApps. Finally, a fused classification model consisting of KNN, XGBoost and random forests is applied to the multi-feature vectors of all DApps for performing DApp classification. The experimental results show that the method is effective. In addition, some positive correlations between feature variables and categories, as well as several user behavior patterns of DApp calls, are found in this paper. 相似文献
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《Digital Communications & Networks》2022,8(6):995-1004
The 5G mobile Internet facilitates contents generation for online communities and platforms through human-to-human collaboration. Wikipedia, a well-known online community, uses wiki technology to build an encyclopedia through collective intelligence and collaboration. Mainstream wiki systems adopt a centralized implementation, and while existing studies have optimized the efficiency of the wiki systems' centralized implementation, these systems still suffer from a lot of problems, for example, opacity and distrust. Over the years, blockchain has brought a flurry of fervour and decentralization to the system architecture, meanwhile giving users a sense of trust and participation. Thus, an innovative blockchain-enabled wiki framework called DecWiki is proposed to build one transparent, truthful, collaborative and autonomous encyclopedia. After several participatory design iterations, we present DecWiki's detailed architecture and its implementation in the form of a smart contract and use the interplanetary file system to complement the big data storage. Meanwhile, we use the trusted execution environment to secure sensitive information in the wireless scenario. Finally, the system overhead and the acceptance of the prototype are evaluated. Extensive experiments present its significant performance. 相似文献
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《Digital Communications & Networks》2020,6(2):167-176
Supply chain traceability is one of the most promising use cases to benefit from characteristics of blockchain, such as decentralization, immutability and transparency, not required to build prior trust relationships among entities. A plethora of supply chain traceability solutions based on blockchain has been proposed recently. However, current systems are limited to tracing simple goods that have not been part of the manufacturing process. We recommend a method that allows for the traceability of manufactured goods, including their components. Products are represented using non-fungible digital tokens that are created on a blockchain for each batch of manufactured products. To create a link between a product and the components that are needed to produce it, we propose “token recipes” that define the amount of tokenized goods required for minting a new token. As input tokens are automatically and transparently consumed when creating a product token, the physical process of producing a new item out of existing components is projected onto the ledger. This ultimately leads to the complete traceability of goods, including the origin of inputs. Evaluating the performance of the system, we show that a prototypical implementation for the Ethereum Virtual Machine (EVM) scales linearly with the amount of the input and goods tracked. 相似文献