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一种双向一次性口令身份认证方案的设计 总被引:1,自引:0,他引:1
提出了一种基于单向散列函数的双向一次性口令身份认证方案(OTPAP),该方案克服了通常的一次性口令方案的弱点,可以用在网络环境下,实现通信双方的互相认证,防止重放攻击和冒充攻击。方案实现简单,执行效率高,可用于电子商务过程中的身份认证,以增强应用系统的安全性。 相似文献
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一种基于ECC的一次性口令身份认证方案 总被引:4,自引:0,他引:4
身份认证机制是网络安全的第一道防线,一次性口令(OTP)技术是不需要第三方参与的身份认证技术,但其本身存在安全漏洞。介绍了一次性口令认证技术的原理,并分析了S/Key一次性口令系统不能抵御冒充攻击以及存在小数攻击等局限性。基于ECC密码体制,对现有的一次性口令系统进行了改进,提出一种可以进行双向认证的一次性口令认证方案。此方案能够进行双向的身份验证,有效地防止了冒充攻击、重放攻击和小数攻击,从而提高了认证系统的安全性。 相似文献
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身份认证机制是网络安全的第一道防线,一次性口令(OTP)技术是不需要第三方参与的身份认证技术,但其本身存在安全漏洞.介绍了一次性口令认证技术的原理,并分析了S/Key一次性口令系统不能抵御冒充攻击以及存在小数攻击等局限性.基于ECC密码体制,对现有的一次性口令系统进行了改进,提出一种可以进行双向认证的一次性口令认证方案.此方案能够进行双向的身份验证,有效地防止了冒充攻击、重放攻击和小数攻击,从而提高了认证系统的安全性. 相似文献
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身份验证是网络应用系统中的第一道防线,目的是验证通信双方的身份,防止非法用户窃取和假冒合法用户。尽管通过口令是最方便的身份验证方法,但它也伴随着字典攻击的威胁。分析了常用的几种一次性口令身份认证方案,在挑战-响应方案基础上,利用安全单向哈希函数提出并设计了一种新型身份验证方案。该方案不仅明显减少了认证服务器的开销,而且能有效地抵御字典攻击、拒绝服务攻击等攻击手段,显著增强了应用系统的安全性。 相似文献
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一种新型一次性口令身份认证方案的设计与分析 总被引:24,自引:4,他引:24
分析了常用的几种一次性口令身份认证方案,在挑战/响应方案的基础上设计了一种新型的身份认证方案。该方案不仅能够提供通信双方的相互认证,减少服务器的开销,而且克服了传统挑战/应答方案的弱点,有效地保护了用户身份信息,能防止重放攻击等攻击手段。最后对该方案的安全性和效率进行了剖析。 相似文献
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身份验证是网络应用系统中的第一道防线,目的是验证通信双方的身份,防止非法用户窃取和假冒合法用户.尽管通过口令是最方便的身份验证方法,但它也伴随着字典攻击的威胁.分析了常用的几种一次性口令身份认证方案,在挑战-响应方案基础上,利用安全单向哈希函数提出并设计了一种新型身份验证方案.该方案不仅明显减少了认证服务器的开销,而且能有效地抵御字典攻击、拒绝服务攻击等攻击手段,显著增强了应用系统的安全性. 相似文献
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一种双因子的双向身份认证系统* 总被引:1,自引:0,他引:1
主要介绍了一次性口令技术和指纹识别技术,分析了一次性口令认证和指纹认证的优缺点;提出了一种基于一次性口令和指纹的身份认证方法,采用单向函数生成一次性口令并用一次性口令加密指纹,实现了客户端和认证服务器的双向认证,解决了小数攻击和指纹泄漏等安全问题,提高了公安业务系统的安全性。 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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David Poole 《Computational Intelligence》1989,5(2):97-110
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
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Watts S. Humphrey 《Annals of Software Engineering》2002,14(1-4):39-72
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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基于复小波噪声方差显著修正的SAR图像去噪 总被引:4,自引:1,他引:3
提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。 相似文献