共查询到20条相似文献，搜索用时 62 毫秒
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结合二维离散混沌系统的伪随机性与对初值的敏感性,提出了一种改进的混沌加密方法．改进后的算法不仅改变像素的位置,也改变每个位置的像素值,实验结果表明了该算法有良好的加密效果． 相似文献
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李睿 《阿坝师范高等专科学校学报》2015,(2):111-114
主要探讨了RSA公钥加密体制的历史和发展,重点探讨该算法的安全性,阐述了RSA公钥加密体制在近距离传感网络应用中做出的一些改进。主要方法是对RSA算法的时间效率和加密算法复杂度进行利弊权衡,最后在两种具体场景的应用中对其安全性进行改进。 相似文献
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云存储为数字教育资源带来海量存储的同时也带来数据安全性问题,针对现有的教育资源云存储平台在数据保密性方面的不足,在数据保密性方面对现有的数字教育资源云存储平台给出改进的方案,主要改进文件加密/解密、数据库加密/解密、密钥管理和客户端4个模块,引用加密算法设计,保证加密效率和加密数据的安全性。 相似文献
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Playfair密码是对称加密中多表加密的一种,针对其原始算法存在的3个缺点提出了相应的改进方案,并对改进方案的可行性进行了论证,最后给出了改进后的算法.对比表明:改进后的加密算法比原算法更具安全性. 相似文献
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陈蕾 《重庆职业技术学院学报》2007,16(3):155-159
加密技术是一种重要的信息系统安全技术,本文讨论加密中使用的随机数的特性,比较各随机数发生器的算法及其在加密中的使用,以求随机性更强的随机数序列,改进加密。 相似文献
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黄文 《湖南科技学院学报》2005,26(5):127-128
Syslog协议有着非常优秀的网络日志管理机制,提供了网络日志的存储方法和传输通道。但是该协议在网络信息安全方面存在着缺乏数据加密、传输加密与认证等多个漏洞,若不加改进地直接应用可能会导致非常严重的安全问题。本文将对这些漏洞进行详细的分析与阐述。 相似文献
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从数据库信息安全的防护角度对面向企业网络的数据库信息安全展开了分析讨论,简单介绍了常见数据库安全措施和数据库信息安全的关键问题,重点提出了企业网数据库信息的加密改进思想。对数据库加密平台的实现展开了讨论,从加密模型框架和加密字典的设计两个角度完成了面向企业网数据库的信息安全设计。 相似文献
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SIP协议正成为VOIP通信的主流协议之一。全面分析了SIP协议面临的安全威胁,然后提出了其加密机制和认证机制的改进方法,并部署安全SIP解决方案。 相似文献
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罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
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Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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陈美曦 《山东教育学院学报》2008,23(2):103-107
Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language. 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
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YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献