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1.
基于椭圆曲线离散对数问题和Brands的受限盲签名技术,提出了一个基于椭圆曲线的离线公平可分电子现金多统.系统具有匿名性,能有效保护消费者的隐私,在必要时可撤销匿名性以打击犯罪,交易过程的公平性通过引入可信第三方实现,防止交易中的某一方受到欺诈,但可信任的第三方只在注册阶段和出现争议时才在线.引入可兑币实现电子现金的可分性,可用于多次精确支竹.该电子现金还具有防止超额支付,重复花费的特点.分析表明,方案是安全的、高效的.  相似文献   

2.
刘义春  胡玉平 《计算机工程》2012,38(18):116-119
在目前的电子现金方案中,电子现金多半不能转移。为此,提出一种用于电子支付的可转移离线电子现金方案,采用限制性盲签名进行电子现金的签发,利用可转换的部分签名进行电子现金的转移。银行和可信第三方无需在线介入每一次交易,使系统效率得到提高。安全性分析结果证明,交易过程中出现重复消费等欺诈行为时,可信第三方能撤销电子现金的匿名性,查明欺诈者。  相似文献   

3.
基于椭圆曲线群签名方案的多银行电子现金系统   总被引:2,自引:0,他引:2  
电子现金系统是一种非常重要的电子支付方式,如何通过群签名确保电子现金系统的安全、高效支付一直是国内外研究的重点.对已提出的椭圆曲线群签名方案进行改进,解决原方案中存在的一个安全问题,并给出成员撤销算法,最后基于改进后的群签名方案提出一个多银行电子现金系统,该系统能够防止用户篡改电子现金的金额、防止敲诈、洗钱和非法购买,同时可以撤销成员的匿名性并灵活地实现成员撤销.  相似文献   

4.
本文对可扩展匿名性的网络支付协议进行了分析,并分析了它的基于角色的访问控制(RBAC)。协议用电子现金支付交易。这是一个离线的支付协议,它可以阻止用户不止一次花费同一电子现金。如果用户担心他们的身份泄露给银行,可以改进匿名性。方案中银行只在需要跟踪时要求用户解密消息,从而进行用户和钱币的跟踪,这样跟踪时用户是知道的,因此简便实用地解决了无可信第三方情况下电子现金匿名性控制问题.  相似文献   

5.
一种可提升用户匿名性的离线电子支付方案   总被引:3,自引:0,他引:3  
提出一种新的具有可提升用户匿名性的离线电子支付方案。用户都可以根据交易时间、计算及通信开销,选择提高其匿名性,还可以从SA代理那里获取面额较小的电子现金用于支付,解决了电子现金的“找零”问题。与其他支付协议相比,该协议还可以恢复因计算机崩溃或文件误删而丢失的电子现金,而且能够防止重复花费、窃听、篡改和高手段的犯罪。  相似文献   

6.
提出一种新的高效的离线可分电子现金方案,在实现公正性的基础上提高电子现金的可分效率。方案利用限制性盲签名思想来实现电子现金的公正性,必要时,在可信的第3方的协助下,银行可撤销电子现金的匿名性;采用同一对密钥对电子现金金额进行签名,既实现电子现金的可分性,又降低方案的计算量和复杂性,同时提高电子现金的安全性。分析结果表明,方案是安全的、高效的。  相似文献   

7.
一种透明的可分电子现金系统   总被引:3,自引:0,他引:3  
介绍了一种基于PVSS的可分电子现金系统。该系统将可公开验证的秘密分享引入电子现金系统,不仅能够在银行和注册商家协作下找出客户的真实身份,以防止客户利用电子现金的不确定性进行犯罪,而且实现了电子现金的多次合法的精确支付,提高了系统的效率。  相似文献   

8.
基于CL签名给出了一种新型的可分电子现金系统,有效地将压缩支付和批处理支付加入到系统中,给出了实用的压缩可分电子现金方案,使得系统的效率较高.系统中无需可信第三方的参与,系统开销较小.方案的安全性基于LRSW假设、计算离散对数困难性假设以及单向散列函数存在性假设.  相似文献   

9.
基于单向累加器理论和二叉树技术,提出了一个同时具有用户匿名性和交易无连接性的离线可分电子现金方案,方案无需可信第三方参与;加入了概率验证算法,既能有效震慑不法用户、保证银行利益不受损失,又能有效降低系统开销。方案安全性基于决策Diffie-Hellman(DDH)假设、计算离散对数困难性假设以及单向散列函数存在性假设。  相似文献   

10.
在分析电子交易的原子性和公平匿名性的基础上,提出了一种可同时实现原子性的公平匿名的电子支付协议,而且在整个支付过程中,可信第三方可以离线,只有发生争议时才参与仲裁解决。给出了协议的6个子协议,详细描述了各子协议的执行过程,并且非形式化地分析了协议的原子性和公平匿名性,保证了公平的电子交易和私密性。  相似文献   

11.
Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.  相似文献   

12.
European Community policy and the market   总被引:1,自引:0,他引:1  
Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.  相似文献   

13.
融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。  相似文献   

14.
Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.  相似文献   

15.
This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.  相似文献   

16.
Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008  相似文献   

17.
《计算机科学》2007,34(4):148-148
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   

18.
Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.  相似文献   

19.
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   

20.
This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)SM and Team Software Process (TSP){SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.  相似文献   

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