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基于Data Access规范的OPC Server的研究与实现 认领 引用 被引量：2
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作者 周强 杨明极 +1 位作者 沈辉 郭剑虹 《哈尔滨理工大学学报》 CAS 2007年第2期107-109,113,共3页
为了实现OPC数据存取服务器,依据OPC数据存取2．05a技术规范,采用了ATL技术,建立了OPC数据存取服务器的结构模型,实现了OPC数据存取服务器的构建及OPC数据存取服务器的主要功能．
关键词 OPC 数据存取 ATL
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Construction of a reusable data access layer based on .NET 认领 引用
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作者 王远斌 《Journal of Chongqing University》 2005年第2期76-79,共4页
A new design solution of data access layer for N-tier architecture is presented. It can solve the problems such as low efficiency of development and difficulties in transplantation, update and reuse. The solution util... A new design solution of data access layer for N-tier architecture is presented. It can solve the problems such as low efficiency of development and difficulties in transplantation, update and reuse. The solution utilizes the reflection technology of .NET and design pattern. A typical application of the solution demonstrates that the new solution of data access layer performs better than the current N-tier architecture. More importantly, the application suggests that the new solution of data access layer can be reused effectively. 展开更多
关键词 N-tier architecture data access layer reflection technology reuse
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A Constraint-Based Model for Virtual Machine Data Access Control in Cloud Platform 认领 引用
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作者 Zhixin Li Lei Liu Kin Wang 《国际计算机前沿大会会议论文集》 EI 2018年第1期33-33,共1页
Virtual machine （VM） data access control provides a cloud- computing platform with guaranteed safety. Given that the cloud platform envi- ronment is dynamically variable, static VM data access operational authorizat... Virtual machine （VM） data access control provides a cloud- computing platform with guaranteed safety. Given that the cloud platform envi- ronment is dynamically variable, static VM data access operational authorization is different from the dynamic cloud platform environment in state determination. This difference affects the safety and performance of VMs in the entire cloud platform. A constraint-based VM data access control model was proposed in this study to evaluate the influence of dynamic environmental change in a cloud plat- form on VM data access control operation. The state information of the dynamic cloud environment was considered a constraint evaluation function. The model realized organic integration of static Bell-LaPadula model safety level and dynamic cloud platform environmental information. A safety policy of VM data access control operation was established, and the capability of the constraint- based access control model to improve the safety of VMs was verified. A model implementation framework and the main functions in combination with the proposed model were realized. The effectiveness and performance of the constraint-based VM data access control model were also evaluated. Results showed that the performance loss was within 7% when the constrained VM data access control model was used for operations, such as VM management. The test of communication intensive workload of a VM indicated that the operating time of the model was increased by approximately 4%. The constraint-based VM data access control model in cloud platform could adapt to the complex dynamic cloud platform environment and improve the safety of VMs. This study provided tech- nical and theoretical bases for VM data access control in cloud platform. 展开更多
关键词 Data access control Virtual machine security Cloud security
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Encoding Necessity for Standing Government Access to Platform-Held Data:A Three-Axis Model 认领 引用
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作者 Linglan Xia 《Journal of Electronic Research and Application》 2026年第5期107-116,共10页
Government access to platform-held data is increasingly implemented not through isolated requests but through durable interfaces:dashboards,periodic reporting pipelines and application programming interfaces.This shif... Government access to platform-held data is increasingly implemented not through isolated requests but through durable interfaces:dashboards,periodic reporting pipelines and application programming interfaces.This shift changes the object of legality.A single request can be assessed by asking whether a stated purpose justifies the particular disclosure.A standing interface,by contrast,creates an ongoing access capability whose intrusiveness accumulates through repetition,aggregation and time.This article develops a three-axis model for encoding the requirement of minimum necessity at the configuration layer of such interfaces.The model treats data fields,extraction frequency and temporal persistence as the minimal auditable surface of standing access,while requiring purpose,recipients,selectors and onward sharing to be recorded in the same authorisation schedule.Using Chinese administrative interface governance as a stress test,especially health-code pipelines and ride-hailing supervisory feeds,the article shows how lawful or plausible access channels can drift through field accretion,cadence escalation and retention extension.EU and US materials are used as design exemplars rather than as complete solutions,illustrating the importance of reasoned requests,strict-necessity limits,duration sensitivity and auditable safeguards.The article concludes by proposing a procedural toolkit:reasoned authorisations,versioned parameter sheets,access logs,renewal triggers,independent audit and remedies for drift.Where feasible,a policy-as-code counterpart can make authorised limits executable at the gateway. 展开更多
关键词 Government data access Platform regulation Data minimisation Proportionality Interface governance China Auditability
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基于Access的电子健康记录管理数据库设计 认领 引用
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作者 欧雪山 《计算机应用文摘》 2026年第3期143-145,共3页
随着信息技术的飞速发展,电子健康记录系统已成为现代医疗体系的重要基础设施,其核心功能是实现患者健康信息的系统化、高效化管理。文章以Microsoft Access数据库为基础,设计并实现了一套电子健康记录管理数据库系统。借助Access平台... 随着信息技术的飞速发展,电子健康记录系统已成为现代医疗体系的重要基础设施,其核心功能是实现患者健康信息的系统化、高效化管理。文章以Microsoft Access数据库为基础,设计并实现了一套电子健康记录管理数据库系统。借助Access平台在数据建模、界面开发与查询统计方面的灵活性优势,构建了覆盖患者基本信息、病历记录、检查结果及用药信息等核心模块的集成化管理平台。系统通过规范化的表结构设计、关系建立及窗体查询功能,支持多维度数据检索与统计分析,有效提升了患者信息管理工作的准确性和效率。实际应用表明,该系统能够显著减少人工录入错误与重复操作,为临床决策及机构管理提供及时、可靠的数据支持。 展开更多
关键词 电子健康记录 Microsoft Access 数据库设计 医疗信息管理 数据查询与统计
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Detection of Turbulence Anomalies Using a Symbolic Classifier Algorithm in Airborne Quick Access Record(QAR)Data Analysis 认领 引用 被引量：2
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作者 Zibo ZHUANG Kunyun LIN +1 位作者 Hongying ZHANG Pak-Wai CHAN 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2024年第7期1438-1449,共12页
As the risks associated with air turbulence are intensified by climate change and the growth of the aviation industry,it has become imperative to monitor and mitigate these threats to ensure civil aviation safety.The ... As the risks associated with air turbulence are intensified by climate change and the growth of the aviation industry,it has become imperative to monitor and mitigate these threats to ensure civil aviation safety.The eddy dissipation rate(EDR)has been established as the standard metric for quantifying turbulence in civil aviation.This study aims to explore a universally applicable symbolic classification approach based on genetic programming to detect turbulence anomalies using quick access recorder(QAR)data.The detection of atmospheric turbulence is approached as an anomaly detection problem.Comparative evaluations demonstrate that this approach performs on par with direct EDR calculation methods in identifying turbulence events.Moreover,comparisons with alternative machine learning techniques indicate that the proposed technique is the optimal methodology currently available.In summary,the use of symbolic classification via genetic programming enables accurate turbulence detection from QAR data,comparable to that with established EDR approaches and surpassing that achieved with machine learning algorithms.This finding highlights the potential of integrating symbolic classifiers into turbulence monitoring systems to enhance civil aviation safety amidst rising environmental and operational hazards. 展开更多
关键词 turbulence detection symbolic classifier quick access recorder data
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KnowID:An Architecture for Efficient Knowledge-Driven Information and Data Access 认领 引用
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作者 Pablo Rubén Fillottrani C.Maria Keet 《Data Intelligence》 EI 2020年第4期487-512,共26页
Modern information systems require the orchestration of ontologies,conceptual data modeling techniques,and efficient data management so as to provide a means for better informed decision-making and to keep up with new... Modern information systems require the orchestration of ontologies,conceptual data modeling techniques,and efficient data management so as to provide a means for better informed decision-making and to keep up with new requirements in organizational needs.A major question in delivering such systems,is which components to design and put together to make up the required“knowledge to data”pipeline,as each component and process has trade-offs.In this paper,we introduce a new knowledge-to-data architecture,KnowID.It pulls together both recently proposed components and we add novel transformation rules between Enhanced Entity-Relationship(EER)and the Abstract Relational Model to complete the pipeline.KnowID’s main distinctive architectural features,compared to other ontology-based data access approaches,are that runtime use can avail of the closed world assumption commonly used in information systems and of full SQL augmented with path queries. 展开更多
关键词 Extended entity-relationship diagrams Abstract relational model Ontology-based data access
Accessing Multi-Source Geological Data through Network in MORPAS Software System 认领 引用 被引量：3
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作者 MeiHongbo HuGuangdao +1 位作者 ChinJian~o LiZhenhua 《Journal of China University of Geosciences》 2003年第3期265-268,共4页
MORPAS is a special GIS (geographic information system) software system, based on the MAPGIS platform whose aim is to prospect and evaluate mineral resources quantificationally by synthesizing geological, geophysical,... MORPAS is a special GIS (geographic information system) software system, based on the MAPGIS platform whose aim is to prospect and evaluate mineral resources quantificationally by synthesizing geological, geophysical, geochemical and remote sensing data. It overlays geological database management, geological background and geological abnormality analysis, image processing of remote sensing and comprehensive abnormality analysis, etc.. It puts forward an integrative solution for the application of GIS in basic-level units and the construction of information engineering in the geological field. As the popularization of computer networks and the request of data sharing, it is necessary to extend its functions in data management so that all its data files can be accessed in the network server. This paper utilizes some MAPGIS functions for the second development and ADO (access data object) technique to access multi-source geological data in SQL Server databases. Then remote visiting and congruous management will be realized in the MORPAS system. 展开更多
关键词 multi-source geological data SQL Server accessing data through network
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DNA Data Storage Gets Random Access 认领 引用
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《Chinese Journal of Biomedical Engineering(English Edition)》 CAS 2017年第1期4-4,共1页
Researchers have devised a system to recover targeted files from 200 megabytes of data encoded in DNA.Random access is a key for a practical DNA-based memory,but until now,researchers have been able to achieve it with... Researchers have devised a system to recover targeted files from 200 megabytes of data encoded in DNA.Random access is a key for a practical DNA-based memory,but until now,researchers have been able to achieve it with only up to 0.15 megabytes of data.DNA data storage involves translating the binary 0s and 1s of digital data into sequences of the four bases A,C,G,and T that make up DNA. 展开更多
关键词 DNA Data Storage Gets Random Access
基于区块链的数据安全共享研究 认领 引用 被引量：1
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作者 郭毅 李旭青 +3 位作者 张子蛟 张宏涛 张连成 张香丽 《信息网络安全》 CSCD 北大核心 2026年第1期1-23,共23页
数据作为数字化时代的“新石油”,要挖掘其蕴含的重要价值,必须保障数据共享的绝对安全。传统数据安全共享模式存在集权化和信任缺失的问题,易引发“单点故障”。区块链技术具备去中心化、透明可追溯和不可篡改的特性,将其应用于数据共... 数据作为数字化时代的“新石油”,要挖掘其蕴含的重要价值,必须保障数据共享的绝对安全。传统数据安全共享模式存在集权化和信任缺失的问题,易引发“单点故障”。区块链技术具备去中心化、透明可追溯和不可篡改的特性,将其应用于数据共享领域,能够显著提升共享过程的安全性与可信性。文章对基于区块链的数据安全共享相关研究工作进行综述。首先,构建了基于区块链的数据安全共享模型,并阐释了数据存储、访问控制、数据传输及隐私保护这3种关键技术的概念与定义;然后,针对数据存储、访问控制、数据传输及隐私保护、跨链技术的相关研究,从基本思想、优缺点及适用场景3个维度展开详细分析与对比;最后,探讨了当前基于区块链的数据安全共享面临的权限动态调整困难、数据隐私与透明性冲突等核心问题,并提出了若干可行的解决思路,同时对未来研究方向进行了展望。 展开更多
关键词 区块链 数据存储 访问控制 数据传输及隐私保护 跨链
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公共数据开放与企业供应链韧性提升——来自公共数据平台建立的证据 认领 引用 被引量：1
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作者 高波 郝少博 高培培 《上海经济研究》 CSSCI 北大核心 2026年第2期45-58,共14页
提升供应链韧性对于增强产业的国际竞争力和保障国家经济安全具有重要意义。数据要素市场的蓬勃发展为提升供应链韧性提供了新的动能。基于2008—2023年中国上市企业数据,以各城市公共数据开放平台的上线为准实验,使用双重差分模型评估... 提升供应链韧性对于增强产业的国际竞争力和保障国家经济安全具有重要意义。数据要素市场的蓬勃发展为提升供应链韧性提供了新的动能。基于2008—2023年中国上市企业数据,以各城市公共数据开放平台的上线为准实验,使用双重差分模型评估了公共数据开放对于企业供应链韧性的影响。研究发现,公共数据开放能够有效提升企业供应链韧性。影响机制分析发现,公共数据开放能够通过提升企业经营效率、提升企业创新水平以及促进企业供应链多元化配置等路径提升供应链韧性。异质性分析发现,公共数据开放提升供应链韧性的经济效应对于年轻企业以及位于政府行政能力较强地区和市场一体化水平较高地区的企业较为显著。扩展性分析发现,省级公共数据平台与市级公共数据平台在提升供应链韧性方面具有积极的协同效应。本文的研究结论能够为利用公共数据平台发挥数据要素资源的放大、叠加和倍增效应,进而构建现代化产业链体系,提供有益的政策启示。 展开更多
关键词 公共数据开放 供应链韧性 数据要素配置 企业创新 供应链多元化
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Database-oriented storage based on LMDB and linear octree for massive block model 认领 引用 被引量：7
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作者 毕林 赵辉 贾明涛 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第9期2462-2468,共7页
Data organization requires high efficiency for large amount of data applied in the digital mine system. A new method of storing massive data of block model is proposed to meet the characteristics of the database, incl... Data organization requires high efficiency for large amount of data applied in the digital mine system. A new method of storing massive data of block model is proposed to meet the characteristics of the database, including ACID-compliant, concurrency support, data sharing, and efficient access. Each block model is organized by linear octree, stored in LMDB（lightning memory-mapped database）. Geological attribute can be queried at any point of 3D space by comparison algorithm of location code and conversion algorithm from address code of geometry space to location code of storage. The performance and robustness of querying geological attribute at 3D spatial region are enhanced greatly by the transformation from 3D to 2D and the method of 2D grid scanning to screen the inner and outer points. Experimental results showed that this method can access the massive data of block model, meeting the database characteristics. The method with LMDB is at least 3 times faster than that with etree, especially when it is used to read. In addition, the larger the amount of data is processed, the more efficient the method would be. 展开更多
关键词 block model linear octree lightning memory-mapped database mass data access digital mine etree
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公共数据开放与战略性新兴企业新质生产力——基于公共数据平台上线的准自然实验 认领 引用 被引量：3
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作者 张轩铭 刘雪炜 刘伟 《财经论丛》 CSSCI 北大核心 2026年第1期26-38,共13页
数字经济时代,公共数据开放作为一种新型公共服务,已成为推动创新和提升企业竞争力的重要政策工具。本文从动态能力理论视角分析公共数据开放与战略性新兴企业新质生产力的关系,并利用中国地级市公共数据平台上线的准自然实验,基于2006... 数字经济时代,公共数据开放作为一种新型公共服务,已成为推动创新和提升企业竞争力的重要政策工具。本文从动态能力理论视角分析公共数据开放与战略性新兴企业新质生产力的关系,并利用中国地级市公共数据平台上线的准自然实验,基于2006—2022年沪深A股战略性新兴产业上市公司数据,采用多时点双重差分方法进行检验。研究发现,公共数据开放显著提升了战略性新兴企业的新质生产力。机制分析表明,公共数据开放通过以下途径提升新质生产力:一是促进企业与高校或其他企业研发联盟的合作效率,加速科研成果的转化;二是推动数字技术的“量质齐升”;三是提升资本和劳动力要素配置效率。此外,在数据要素利用水平越高、市场竞争越激烈、创新补贴越低及税收优惠越大的企业中,公共数据开放对战略性新兴企业新质生产力的促进效应越显著。本文揭示了公共数据开放通过协同创新激活、技术代际跃迁、要素重构升级培育新质生产力的动态能力演化规律,为数据赋能战略性新兴产业提供了理论锚点与政策抓手。 展开更多
关键词 公共数据开放 战略性新兴产业 新质生产力 产学研合作 数字技术创新
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竞争法视域下数据访问制度构建研究 认领 引用 被引量：1
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作者 王煜婷 《法学论坛》 CSSCI 北大核心 2026年第1期150-163,共14页
使用互联产品或机器产生的使用数据和使用在线服务产生的行为数据可以说是数据驱动型市场的重要输入,对此类数据的占有和控制引发了一系列市场失灵的问题。竞争法视域下的数据访问制度旨在确保产品或相关服务的用户能够有权访问他们通... 使用互联产品或机器产生的使用数据和使用在线服务产生的行为数据可以说是数据驱动型市场的重要输入,对此类数据的占有和控制引发了一系列市场失灵的问题。竞争法视域下的数据访问制度旨在确保产品或相关服务的用户能够有权访问他们通过使用产品或服务“共同生成”的数据,从而缓解基于数据的“锁定”效应,促进相关联市场的创新和竞争,保障数据的公平获取和使用,并在数据驱动型市场中为“择优竞争”建立新的基准。我国应当建立双轨制的数据访问制度,即在建立全国性数据基本法律制度时确立对数据的一般访问权,同时结合不同行业使用数据、不同种类数据、不同数据主体等多样化因素,再制定具体的定制化数据访问规则。数据访问制度应兼顾多元利益平衡,创设可放弃的数据访问、使用和可携性权利。强化独立数据中介商作用,进一步补充、完善数据访问制度。 展开更多
关键词 数据访问 市场失灵 竞争法 使用数据 数据中介商
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共同富裕背景下数据要素共享与城乡融合发展——基于政府数据开放平台的准自然实验 认领 引用 被引量：1
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作者 杨肃昌 张世斌 《农村经济》 CSSCI 北大核心 2026年第1期118-127,共10页
共同富裕背景下,数据要素共享是激活与释放数据要素价值、推动城乡居民共享数字红利的关键举措,是推动城乡融合发展的重要力量。以中国城市上线政府数据开放平台为准自然实验,运用多期双重差分模型展开实证分析,检验数据要素共享对城乡... 共同富裕背景下,数据要素共享是激活与释放数据要素价值、推动城乡居民共享数字红利的关键举措,是推动城乡融合发展的重要力量。以中国城市上线政府数据开放平台为准自然实验,运用多期双重差分模型展开实证分析,检验数据要素共享对城乡融合发展的影响。研究发现,数据要素共享对城乡融合发展具有显著促进作用,该基本结论经过一系列内生性处理和稳健性检验后仍然成立。机制分析表明,数据要素共享通过城乡信息壁垒、城乡要素流动与配置、城乡制度性交易成本、城乡绿色转型等渠道影响城乡融合发展。异质性分析表明,数据要素共享对城乡融合发展的促进效应在区域上呈“东部—中部—西部”依次递增之势,对要素禀赋存在优势和行政级别更高的城市,促进效应更大。基于此,各地方政府应全面推动政府数据的开放共享,促进城乡融合进程加快推进。 展开更多
关键词 数据要素 数字经济 政府数据开放 城乡融合发展
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基于多源大数据的中国一线城市院前急救服务可达性与公平性研究 认领 引用 被引量：1
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作者 朱浩嶙 徐墨 +1 位作者 朱蕗颖 崔彤 《西部人居环境学刊》 CSCD 北大核心 2026年第1期63-71,共9页
院前急救系统是城市公共医疗系统的重要组成部分,急救效率直接决定了患者的生存结果。为精确评估城市急救服务效率与公平,以“北上广深”四个一线城市为例,构建人居空间矩阵结合开放地图应用编程接口的急救时空可达性研究模型,并通过泰... 院前急救系统是城市公共医疗系统的重要组成部分,急救效率直接决定了患者的生存结果。为精确评估城市急救服务效率与公平,以“北上广深”四个一线城市为例,构建人居空间矩阵结合开放地图应用编程接口的急救时空可达性研究模型,并通过泰尔指数及线性回归模型分析城市急救服务的“空间公平性”以及“群体公平性”。结果显示,在交通通畅期,四个城市人均急救反应时间均不超过12.5 min(12.24~12.49 min);但交通高峰期急救可达性显著降低。同时,四个城市均存在显著的城区差异,且低收入群体急救面临更严重的急救延迟。研究证明,中国一线城市院前急救系统在公平建设中仍存在很大不足,研究结果对城市院前急救系统的全面评价与持续性建设具有现实意义。 展开更多
关键词 院前急救服务 多源大数据 可达性 公平性 线性回归
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A blockchain-based transaction system for private data sharing and trading 认领 引用 被引量：1
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作者 Wei Cui Yu Pan Zhendong Ai 《Control Theory and Technology》 EI CSCD 2022年第3期291-302,共12页
To address the private data management problems and realize privacy-preserving data sharing,a blockchain-based transaction system named Ecare featuring information transparency,fairness and scalability is proposed.The... To address the private data management problems and realize privacy-preserving data sharing,a blockchain-based transaction system named Ecare featuring information transparency,fairness and scalability is proposed.The proposed system formulates multiple private data access control strategies,and realizes data trading and sharing through on-chain transactions,which makes transaction records transparent and immutable.In our system,the private data are encrypted,and the role-based account model ensures that access to the data requires owner’s authorization.Moreover,a new consensus protocol named Proof of Transactions(PoT)proposed by ourselves has been used to improve consensus efficiency.The value of Ecare is not only that it aggregates telemedicine,data transactions,and other features,but also that it translates these actions into transaction events stored in the blockchain,making them transparent and immutable to all participants.The proposed system can be extended to more general big data privacy protection and data transaction scenarios. 展开更多
关键词 Private data sharing Blockchain Data access control Proof of Transactions
电力环保监测多终端数据库安全准入Markov控制 认领 引用
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作者 李熙 王重卿 +2 位作者 江世雄 陈垚 陈鸿 《电子设计工程》 2026年第14期7-11,18,共5页
针对现有电力环保监测多终端数据库安全准入控制方法存在的延迟高、资源消耗大等不足,设计了一种基于Markov的控制方法。设计异步滑模控制器并同步推导Markov算法表达式,同时在电力环保监测数据库中部署多终端节点;根据数据库的存储容... 针对现有电力环保监测多终端数据库安全准入控制方法存在的延迟高、资源消耗大等不足,设计了一种基于Markov的控制方法。设计异步滑模控制器并同步推导Markov算法表达式,同时在电力环保监测数据库中部署多终端节点;根据数据库的存储容量规划标准,求解细粒度准入参数,获取安全控制算法的函数表达式,以实现对电力环保监测多终端数据库准入数据的安全控制。实验结果表明,提出方法可以有效防止风险性数据进入数据库,且在输入数据的过程中已存储数据的安全性不会受到威胁,传输速率与目标值的差距小于0.1 bit/ms。由此可以得出结论,提出方法能够降低电力环保监测数据库的运行风险,有效保护数据库终端中的敏感信息。 展开更多
关键词 电力环保监测 多终端数据库 数据准入 Markov控制 异步滑模控制器 细粒度参数
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中继链环境下一种2阶段跨链访问控制机制 认领 引用
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作者 张佩云 陶帅 +1 位作者 陈健 陈子寒 《计算机研究与发展》 EI CSCD 北大核心 2026年第1期255-272,共18页
随着区块链技术的迅速发展,数据等资产已不满足于只在单个区块链上流通,因此跨链技术应运而生。跨链技术改善了区块链数据孤岛问题,但也为数据在不同区块链上的传输与共享带来了新的挑战。一方面,不同区块链用户存储数据方式通常不同,... 随着区块链技术的迅速发展,数据等资产已不满足于只在单个区块链上流通,因此跨链技术应运而生。跨链技术改善了区块链数据孤岛问题,但也为数据在不同区块链上的传输与共享带来了新的挑战。一方面,不同区块链用户存储数据方式通常不同,各区块链数据验证方式往往也不统一。因此,其他区块链上的用户可能传输虚假或者不一致的数据,导致数据难以被有效验证其真实性和一致性,从而影响跨链访问控制的可靠性。另一方面,虽然当前代理重加密技术能有效实现1对1的访问控制,但单一代理存在中心化问题,以及在跨链场景下面临多用户并发导致的访问控制时间开销大的问题。针对上述问题,提出中继链环境下一种2阶段跨链访问控制机制,分别从数据验证和代理重加密阶段2个阶段进行设计。在数据验证阶段,为确保加密数据的来源真实性和一致性,结合Fiat-Shamir启发式与星际文件系统(interplanetary file system,IPFS),设计一种数据验证方法对数据进行快速验证,使得加密数据可被用户正确接收,加密数据在IPFS中安全存储以缓解链上存储压力;在代理重加密阶段,设计一种改进的阈值代理重加密方法,以有效应对多用户场景下的访问控制,基于重加密更新算法对重加密过程进行优化,在实现去中心化重加密的同时,降低重加密的时间开销,并有效提高多用户访问控制的重加密事务处理效率。实验结果表明,所提出的机制在数据验证方面的开销较小,并在多用户场景下加密、重加密及解密过程的开销均优于对比方法。 展开更多
关键词 中继链 代理重加密 数据验证 访问控制 数据共享
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Reversible Data Hiding Algorithm in Encrypted Images Based on Adaptive Median Edge Detection and Ciphertext-Policy Attribute-Based Encryption 认领 引用
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作者 Zongbao Jiang Minqing Zhang +2 位作者 Weina Dong Chao Jiang Fuqiang Di 《Computers, Materials & Continua》 SCIE EI 2024年第10期1123-1155,共33页
With the rapid advancement of cloud computing technology,reversible data hiding algorithms in encrypted images(RDH-EI)have developed into an important field of study concentrated on safeguarding privacy in distributed... With the rapid advancement of cloud computing technology,reversible data hiding algorithms in encrypted images(RDH-EI)have developed into an important field of study concentrated on safeguarding privacy in distributed cloud environments.However,existing algorithms often suffer from low embedding capacities and are inadequate for complex data access scenarios.To address these challenges,this paper proposes a novel reversible data hiding algorithm in encrypted images based on adaptive median edge detection(AMED)and ciphertext-policy attributebased encryption(CP-ABE).This proposed algorithm enhances the conventional median edge detection(MED)by incorporating dynamic variables to improve pixel prediction accuracy.The carrier image is subsequently reconstructed using the Huffman coding technique.Encrypted image generation is then achieved by encrypting the image based on system user attributes and data access rights,with the hierarchical embedding of the group’s secret data seamlessly integrated during the encryption process using the CP-ABE scheme.Ultimately,the encrypted image is transmitted to the data hider,enabling independent embedding of the secret data and resulting in the creation of the marked encrypted image.This approach allows only the receiver to extract the authorized group’s secret data,thereby enabling fine-grained,controlled access.Test results indicate that,in contrast to current algorithms,the method introduced here considerably improves the embedding rate while preserving lossless image recovery.Specifically,the average maximum embedding rates for the(3,4)-threshold and(6,6)-threshold schemes reach 5.7853 bits per pixel(bpp)and 7.7781 bpp,respectively,across the BOSSbase,BOW-2,and USD databases.Furthermore,the algorithm facilitates permission-granting and joint-decryption capabilities.Additionally,this paper conducts a comprehensive examination of the algorithm’s robustness using metrics such as image correlation,information entropy,and number of pixel change rate(NPCR),confirming its high level of security.Overall,the algorithm can be applied in a multi-user and multi-level cloud service environment to realize the secure storage of carrier images and secret data. 展开更多
关键词 Ciphertext-policy attribute-based encryption complex data access structure reversible data hiding large embedding space
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