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基于椭圆曲线的前向安全签密方案 总被引:2,自引:0,他引:2
签密可在同一逻辑步中同时完成签名和加密两项功能,其代价远小于"先签名后加密"的传统实现方式,是构造信息安全系统的有效工具.研究了IEEEP1363标准定义的椭圆曲线签名体制,指出了该体制存在的两个安全缺陷:不能为签名提供保密服务、密钥不具有前向安全性.结合椭圆曲线密钥交换协议和签密的思想,构造了一个具有前向安全性的签密方案.该方案以一般椭圆曲线密码系统为基础,可以同时实现签名、加密以及对称密钥建立等功能.该方案的密钥建立过程是前向安全的,签名是前向安全的和不可伪造的. 相似文献
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一个基于椭圆曲线的可证明安全签密方案* 总被引:1,自引:0,他引:1
签密能够在一个合理的逻辑步骤内同时完成数字签名和加密两项功能。与实现信息保密性和认证性的先签名后加密方案相比,签密具有较低的计算和通信代价。提出一个基于椭圆曲线的签密方案,能够同时完成数字签名和加密两项功能。基于可证明安全性理论,在GDH(gap Diffie-Hellman)问题难解的假设之下,该方案在随机预言机模型中被证明是安全的。该方案能够抵御自适应选择明文/密文攻击。 相似文献
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蔡庆华 《计算机技术与发展》2007,17(12):132-135
签密就是能够在一个逻辑步骤内完成数字签名和加密两项功能,比传统的先签名后加密有更高的效率。在椭圆曲线密码体制下,提出一个具有公开可验证性的和前向安全的签密方案,并分析了该方案的安全性,解决了签密方案设计上的一个公开问题。文中方案可以应用于许多特殊场合,如电子现金、匿名认证等,实现了前向安全性。 相似文献
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本文提出了一种指定验证者的对明文消息进行多重签名并加密传输的多重签密方案。该方案由多个签名者对消息进行签名并同时进行加密传输,并且只有由签名方指定的验证者才能解密并验证签名,在一定的条件下还可以转化成普通的多重签名方案。该方案是基于椭圆曲线密码的,故其安全性主要依赖椭圆曲线离散对数问题的难解性,分析表明此方案具有安全高效的特点,在电子政务及党政系统中具有广泛的应用价值。 相似文献
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基于椭圆曲线密码体制的(t,n)门限签密方案* 总被引:10,自引:1,他引:9
首先提出一个基于椭圆曲线密码体制的签密方案。该方案是数字签名和公钥加密的有机集成,除了具有认证性、保密性外,还具有计算量与通信量小等特点。在此基础上,构造了一个基于椭圆曲线密码体制的(t,n)门限签密方案。该方案具有数据传输安全、鲁棒性、通信代价更小、执行效率更高等特点。还给出两种方案的安全性分析。 相似文献
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S. Shaw 《Journal of Computer Assisted Learning》1993,9(2):93-99
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
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European Community policy and the market 总被引:1,自引:0,他引:1
C. Lloyd 《Journal of Computer Assisted Learning》1993,9(2):86-91
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
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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
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Wayne O’Brien Author Vitae 《Journal of Systems and Software》2008,81(11):1997-2013
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
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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
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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
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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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《控制理论与应用(英文版)》2014,(3)
正The 34th Chinese Control Conference and SICE Annual Conference 2015(CCCSICE2015)is organized by the Technical Committee on Control Theory(TCCT)of Chinese Association of Automation(CAA)and the Society of Instrument and Control Engineers(SICE)of Japan,and locally organized by Hangzhou Dianzi University(HDU). 相似文献
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该文利用DF与CHI统计量相结合的特征选取方法,针对互联网上对外汉语相关领域的网页进行特征提取,并在此基础上,构建了基于标题与正文相结合的两步式主题相关度判定分类器。基于该分类器做对外汉语相关主题的网页爬取工作,实验表明,效率和召回率比传统分类器都有较大程度的提高,目前该分类器已经用于为大型对外汉语语料库构建提供数据源。 相似文献