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为适应云环境中移动手机等资源限制型设备的使用,降低基于多授权属性基加密的会话密钥协议的计算和通信代价,提出一种能生成固定密文长度交换消息的协议。该协议基于多值访问结构,加强了数据拥有者对系统模型的权限控制;在基于属性的BJM(Blake-Johnson-Menezes)模型和选择访问结构安全模型下,基于判定性q并行双线性Diffie-Hellman指数(q-PBDHE)假设证明了该协议的安全性。通过实验比较分析了类似协议的性能,表明该协议具有较高效率和安全性,适合在轻量级应用场景上使用。 相似文献
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传统的属性基加密方案中存在着访问策略所包含的属性会泄露用户的敏感信息以及恶意用户泄露私钥获取非法利益而不会被追责的问题。同时私钥长度、密文长度和解密运算量均会随属性数量增加而带来较大的通信开销和计算开销。针对以上问题提出了一种可追踪且隐藏访问结构的属性基加密方案。该方案在不影响加/解密效率的前提下提高了加密算法的安全性,并采用双因子身份认证机制实现了更安全高效的访问控制。并且引入一个安全的签名机制用于支持可追踪密钥来追踪恶意用户。该方案基于DBDH假设,在标准模型下被证明是安全的。 相似文献
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《计算机应用与软件》2014,(2)
针对现有密文策略的属性集合加密CP-ASBE(Ciphertext-Policy Attribute-Sets Based Encryption)构建复杂以及无法达到更高的安全性要求的问题,提出一种改进的CP-ASBE方案。该方案通过简化用户的密钥结构以及仅考虑AND门的访问结构进行构建,为增强其安全性,方案引入强存在性不可伪造签名机制。通过分析证明,该策略在判定双线性Diffie-Hellman假定条件下是选择密文攻击安全的。模拟实验表明,相比现有方案,该方案具有较高的加密和解密效率。 相似文献
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属性基加密作为一种一对多的加密机制,能够为云存储提供良好的安全性和细粒度访问控制。但在密文策略属性基加密中,一个解密私钥可能会对应多个用户,用户可能会非法共享其私钥以获取不当利益;另外,访问策略通常包含敏感信息,这对隐私性要求较高的场合造成了重大挑战。针对上述问题,提出一个隐藏访问策略的可追踪密文策略属性基加密方案。该方案基于合数阶双线性群进行构造,通过将用户的身份信息嵌入到该用户的私钥中实现可追踪性,将访问策略中的特定敏感属性值隐藏在密文中实现策略隐藏,利用解密测试技术提高解密效率,给出了在标准模型下方案是完全安全和可追踪的证明。对比分析表明,该方案在解密运算方面有所优化,从而降低了解密运算开销,提高了效率。 相似文献
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基于文件层次结构的属性加密方案在云存储环境下是高效率、低存储的,但访问结构本身包含敏感信息,存在用户信息泄露、文件易被窃取的风险,针对这一问题提出了一种隐藏访问结构的文件层次属性加密方案。该方案在不影响加密解密效率的前提下提高了加密算法的安全性,并采用双因子身份认证机制实现了更安全高效的访问控制。该研究成果基于判定性双线性Diffie-Hellman假设,在标准模型下被证明是安全的。 相似文献
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本文中,我们首先证明了李增鹏等人提出的多比特多密钥全同态加密方案(MFHE)满足密钥同态性质,利用此性质,可以通过门限解密得到最终解密结果.使用该方案,我们设计了一个在CRS模型下和半恶意攻击者模型下安全的三轮多方计算协议(MPC).该安全多方计算协议的安全性是基于容错学习问题(LWE)的两个变种问题Ferr LWE和Some are errorless.LWE,而且,通过非交互的零知识证明,我们可以把半恶意攻击者模型下安全的三轮多方计算协议转变为在恶意模型下安全的三轮多方计算协议. 相似文献
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张涛 《计算机测量与控制》2015,23(1):86-89
为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值. 相似文献
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Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China. 相似文献
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In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times. 相似文献
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《Information & Management》2016,53(6):787-802
Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice. 相似文献
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Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs. 相似文献
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Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel. 相似文献
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《浙江大学学报:C卷英文版》2014,(11)
正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and 相似文献
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Zhao-hui WU 《浙江大学学报:C卷英文版》2014,(10)
正Brain-machine interfaces(BMIs)aim at building a direct communication pathway between the brain and an external device,and represent an area of research where significant progress has been made during the past decade.Based on BMIs,mind information can be read out by neural signals to control 相似文献
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《浙江大学学报:C卷英文版》2014,(10)
正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate 相似文献