共查询到20条相似文献，搜索用时 62 毫秒
1.
针对传统的数字图像加密方式繁多,或加密步骤冗杂,或计算数据量庞大等特点,在图像数据加密的可操作性和安全性等方面构想出了一种新的加密算法,这种算法基于利用函数使图像矩阵的像素发生位移和像素值改变,双管齐下从而置乱加密矩阵进行加密.由于加密是通过多项式和矩阵变换达成,因此该算法也具有易于操作,计算复杂程度较低,加密、解密高速效率的特点,应用前景广阔. 相似文献
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孙彬 《新疆教育学院学报》2004,20(4):91-93
目前加密传输已成为信息安全处理的核心问题.本文的内容是结合ECC特点,讨论如何在PC之间将数据加密和传输,探讨一个安全、快捷和方便的计算机语言算法. 相似文献
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基于Visual FoxPro的MIS系统的三重保密措施 总被引：1，自引：0，他引：1
本文系统地探讨了MIS系统的三种加密方法,并讨论了各自的特点和适用性,在此基础上给出了其具体的实现程序或实现方法. 相似文献
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在引入网络安全问题的基础上,研究了目前的两种加密体制(对称加密和公钥加密),分别对其思想、方法和特点进行了讨论,着重分析了DES算法和RSA算法。阐述了结合DES算法和RSA算法的混合加密思想,对混合加密技术在结构上进行了详细的描述,同时分析了混合加密的优点。 相似文献
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苏雅丽 《赤峰学院学报(自然科学版)》2014,(23):17-18
本研究提出一种基于混沌系统的图像加密方案,并对混沌加密序列进行了改进,使得这种序列具有更好的统计均匀特性,提高了加密图像抗破解攻击的难度.通过实验和理论分析可知,本加密算法满足密码学所需要的混沌与扩展特性.另外算法加解密简单也是算法设计的一个特点,这些特性使得本算法在图像加密和图像传输中具有一定的应用价值. 相似文献
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主要是对三种公钥加密体制进行了详细的分析和比较,指出了ECC椭圆曲线加密体制所具有的技术优势和特点,它必将成为通用的公钥加密算法. 相似文献
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基于混沌加密理论,提出了一种适用于图文数据加密的通信方案.该方案有效地改善了传统数据加密方法中同步性差、且无法简单解决方法的缺陷.理论分析和数值计算验证了该方案的有效性,表明它在数据加密领域中具有潜在的应用前景. 相似文献
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针对无线Mesh网络的开放性和通信易受到外部攻击的特点,在分析常见的无线网络加密方法及其存在问题的基础上,设计了一种基于PRESENT的轻量级加密算法,并将该加密方法应用于无线网络。实验表明,该加密方法增强了无线网络的安全性,同时也优化了无线网络性能。 相似文献
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王宏杰 《天津工程师范学院学报》2003,13(3):34-36
探讨了采用数据加密技术实现对数据库中重要数据存储的安全保护,对数据库密码系统的基本流程、数据库加密的特点、加密的范围、加密对DBMS原有功能的影响进行了分析研究.结果表明,加密对数据库中重要数据的安全保护是可行的、有效的,但加密对DBMS某些原有功能是有影响的,需在DBMS层上考虑解决. 相似文献
10.
于家杰 《山东教育学院学报》2013,28(3)
本研究采用加密和数字签名的方法,提出一种基于编码的数字水印算法.本算法通过在文本中冗余的嵌入水印来提升水印的嵌入量.本算法具有算法健壮、安全、水印不可见、容量大等特点. 相似文献
11.
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
12.
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
13.
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
14.
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
18.
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
19.
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
20.
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