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1.
CPK标识认证系统的设计及实现   总被引:1,自引:0,他引:1  
介绍了组合密钥算法(CPK)的原理,提出了基于CPK的标识认证系统的一种构建方法.通过使用基于标识的组合映射算法的密钥管理方法,实现了规模化的密钥管理和独立于第三方的身份认证目的,解决了现有认证系统中认证效率低,可扩展性差等问题.系统通过测试,运行正常.  相似文献   

2.
通过对基于Logistic映射的混沌加密算法原理的分析,提出了一种基于Logistic映射的交叉加密算法.该算法利用2个一维混沌系统对明文进行交叉异或和求余运算.使用2个混沌系统扩大了密钥窄间,并增加了密钥的复杂性,提高了抗破译强度.实验结果表明此算法运算速度快,密文对密钥敏感.该算法具有较好的安全性且易于实现.  相似文献   

3.
结合混沌符号动力学原理及 1-D 分段线性映射混沌系统,提出一种能够实现数字图像加密的像素位和像素值的置乱算法.该算法利用混沌符号动力学原理,仅利用一个密钥参数便可完成多密钥的置乱加密过程,而且能同时完成像素位和像素值的不同密钥加密,大大加强了密钥的搜索空间,增强了抗破解的能力.实验结果表明,该算法具备实现简单、加密速...  相似文献   

4.
提出了一种新的基于秘密共享方案的数字图像水印算法,其主要特点是将原始水印分成两份,一份嵌入载体图像增加系统安全性.通过载体图像生成一个辅助矩阵(极性矩阵),第二份和极性矩阵用来产生一个主密钥和若干个普通密钥.在此系统中,只有拥有主密钥的用户才能直接恢复出真正的水印,其他拥有普通密钥的用户只能恢复阴影水印,将那些阴影水印联合起来,才能恢复出真正的水印,所以算法具有一定的实用价值.实验结果证明:所提出的水印算法对JPEG压缩、椒盐噪声、剪切等图像处理攻击具有很好的鲁棒性.  相似文献   

5.
人脸特征密钥的容错生成算法*   总被引:1,自引:0,他引:1  
提出了人脸特征的密钥生成算法,该算法采用了FCS算法思想,利用纠错编码技术和hash算法将用户随机密钥用生物特征信息隐藏,实现了安全的密钥恢复和身份认证双重功能,不仅有效地保护了用户密钥而且防止了用户生物特征信息泄露.实验表明,该算法对生物密钥的生成和安全管理是一种行之有效的方法.  相似文献   

6.
随着移动通信系统技术的发展,信息传输形式也逐渐多样化,信息传输的安全性也日显重要.针对手机的硬件性能特点,设计了基于 IDEA 算法改进的 X-IDEA 算法应用于手机图文信息安全传输,较好地解决了 IDEA 算法的弱密钥等问题,X-IDEA 算法的加密过程也使得其混淆性与扩散性较 IDEA 算法更强.根据移动通信系统的特征,提出了一种基于身份的密钥管理方法,该方法可使通信双方安全地获得密钥且计算量和通信量较小.实验证明了 X-IDEA 算法应用于手机图文安全传输的高效性和安全性  相似文献   

7.
该文针对卫星广域网的特点,分析了该系统的数据完全问题,指出在卫星数据通信网中实施公共密钥算法进行密钥管理的必要性和可能性,提出了一种基本公开密钥算法和传统密钥算法相结合的保密通道实现方式,并给出了保密性分析。  相似文献   

8.
崔鑫  曹祎 《微处理机》2012,33(1):60-62
为了满足安全数字出版技术的需求,提出了一种融合高级加密与消息认证算法的新型解决方案.系统通过HMAC算法做为消息认证机制,核心Hash函数采用引入私密密钥后的HMAC技术的SHA-1算法.数字出版文件的加密是系统算法的第二层,AES加密算法具有可选的密钥长度,提供优于DES及3DES算法的加密性能,通过AES算法加密的文件难于破解.同时系统中采用客户端无法更改的机器ID号作为AES算法的加密密钥,客户端密文使用时需读取ID号进行动态解密,并且解密后的文件不会存储在设备硬盘中,防止了解密文件的非法发布.  相似文献   

9.
分布式组播密钥管理协议中的组密钥生成算法研究   总被引:1,自引:0,他引:1  
在分布式组播密钥管理协议中,组内成员间的逻辑结构对组密钥生成算法起着至关重要的作用.设计了一种新的DSTR密钥树结构,在此基础上提出了针对该结构求解组内成员相关节点盲密钥的算法和高效的组密钥生成算法.最后,对DSTR密钥树结构进行了安全性分析,并利用两方DDH难题对DSTR逻辑密钥树的安全性进行了证明.  相似文献   

10.
蒋刚  郭祥  杨晨  丁召 《计算机仿真》2021,38(5):176-180
提出了一种混沌和DNA运算结合的图像加密算法,为了实现密钥与明文关联,算法引入了哈希函数,借助哈希函数的单向性和雪崩效应,实现密钥与明文关联,增大密钥空间.通过哈希函数SHA-512计算明文图像和外部密钥的哈希摘要,并将其作为内部密钥.同时算法结合高维Chen氏超混沌系统和一维SPM映射进行设计,对明文图像进行分块处理,然后在Chen氏超混沌序列的选择下对各个明文图像块进行DNA加密运算,最后将加密得到的各密文块合成为密文图像.算法通过编程进行了仿真,结果表明提出的算法具备抗统计分析攻击和抗差分攻击等能力.  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.
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   

18.
《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   

19.
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   

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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