Results 51 to 60 of about 1,750 (147)
STBM: secure and trustworthy blockchain-based model for cybersecurity service transactions [PDF]
To overcome the numerous challenges faced by traditional models of cybersecurity service transactions, adapt to the needs of industrial digitalization, and address the inconveniences and opacity of cybersecurity service transactions, a secure and ...
PIAO Guirong, ZHU Jianming
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智能科学与技术学报, 2019 区块链的广泛应用使越来越多的学者聚焦到安全加密这一重大问题上。然而，随着电子计算机技术的飞速发展，远超传统计算速度和数据处理容量的量子计算机已经逐步从理论走向实践，它的极大算力将给区块链的链内安全带来巨大和根本性的挑战。介绍了量子信息的两大核心应用，分析了量子霸权对区块链现行的共识方式和加密算法的破解方式。同时，针对目前区块链的漏洞，提出量子区块链以防止量子计算带来的攻击威胁，并阐述了量子通信技术的原理与应用方法，举例说明了量子区块链的安全性与可行性。最后，对目前量子计算存在的几大技术挑战进行了分析。
张俊, 袁勇, 王晓, 王飞跃
doaj
Zhejiang Daxue xuebao. Lixue ban, 2019 从生态位相关理论应用出发，基于生态位宽度、重叠度和密度解析村落养老价值的影响源和影响机制。在建立都市区村落养老行业系统的基础上，结合需求度调查，归纳了行业生态链中的生态元功能组成。并以影响源推导评价子系统，以生态元功能衍生出评价模块，从村落养老的时间位、空间位、功能位上的优势目标出发，构建了一个与生态位关联，由评价维度、价值子系统、模块、指标变量4 个层级组成的都市区村落养老价值评价体系。此体系的研究立足于生态位对村落养老价值的影响机制和养老产业良性发展的适应性，为村落养老价值评价体系的构建提供了新视角，
LIUSheng(刘声) +2 more
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智能科学与技术学报, 2022 元宇宙作为虚实融生的三元世界，为人们提供了海量多样化的网络服务，但由于缺乏现实世界的面对面交流且无法打破地理与时间的限制，现有方案无法在高效认证数字公民的同时实现隐私保护与监管。基于此，提出一种面向元宇宙的数字公民身份认证方案。依据身份时效性设计分层认证方案，基于 Paillier 同态加密和保持结构性签名等算法实现去中心化标识符与可验证凭证的双重不可链接，并借助代码嵌入技术保障公民的被遗忘权，保护公民隐私；而且在认证过程中嵌入监管因子，以供日后追责。最后，安全性分析证明了所提方案满足不可链接性 ...
吕秋云 +4 more
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Research on Application of Blockchain in PKI Security [PDF]
The design idea of emphasizing application and neglecting defense leads to the lack of endogenous security attributes at the beginning of the design of transmission control protocol/Internet protocol (TCP/IP) architecture. Public key infrastructure (PKI),
XIA Lingling, WANG Qun, MA Zhuo, LIANG Guangjun
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Research on sybil attack in defense blockchain based on improved PBFT algorithm [PDF]
, 2020 Aiming at the problem that sybil attack has great harm to block chain technology,a method to improve the PBFT algorithm in the alliance chain to defend against sybil attacks was proposed.Firstly,using the idea of consensus algorithm based on proof of ...
Jing LIU, Yingxu LAI, Zunxu BO
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野生动物学报, 2022 国境口岸截获象牙的地理溯源是识别非法象牙来源地,确定走私热点地区,描绘走私通道,有针对性地打击象牙非法贸易的重要前提。利用线粒体DNA单倍型溯源的方法,对我国的126份国境口岸截获象牙样本进行地理溯源。从126份样本中共得出22个地理单倍型,为2个支系和7个进化枝。通过Loxodonta Localizer 数据库比对分析,109份样本确定了地理来源,进而推断出3个来源地:中非刚果盆地的Tridom跨境生态保护区,东非的肯尼亚、坦桑尼亚和乌干达等国及非洲南部的KAZA跨境保护区 ...
苏 倡 +5 more
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智能科学与技术学报, 2019 全球能源互联网旨在构建以电力消费为核心的能源模式，跨国跨洲电力交易是推动其发展的必要条件和有效途径。首先分析跨国跨洲电力交易面临的问题，提出了基于区块链和通证经济的跨国跨洲电力市场设计思路。然后，将跨国跨洲电力市场的组成分为5个部分，并分别对这5个部分进行了描述与建模。最后，利用等比例放大的IEEE 39节点系统，对本文所提市场进行了仿真与分析。仿真结果表明，基于区块链和通证经济的跨国跨洲电力市场可以保证跨区域、多主体电力交易的有效实施，同时有利于激励发电商使用清洁能源参与电力市场。
陈思远, 白昱阳, 张俊, 王飞跃
doaj
Design and Implementation of Blockchain-Based Anti-counterfeiting and Traceability System for Sesame Oil [PDF]
Sesame oil is one of the indispensable cooking oils in daily diets, and its quality and safety has aroused wide concern. However, the issue of sesame oil adulteration has become increasingly serious, making it urgent to guarantee the quality and safety ...
XU Jinsheng, ZHANG En
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Design for database access control mechanism based on blockchain [PDF]
, 2020 Aiming at the current problems of database access control,the thought of blockchain technology applied to database access control was proposed.The implementation mechanism of database access control based on blockchain was designed from several aspects ...
Jianming ZHU, Yonggui FU
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