共查询到20条相似文献，搜索用时 859 毫秒
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陈琳 《湖州师范学院学报》2006,28(1):104-108
介绍了现有的几种安全多播密钥管理机制,并就各种方法的优缺点进行了比较分析,指出多播应用中的密钥管理复杂,在没有通用的管理和控制方法的情况下,只能根据自身的特点和规模选择相应的安全控制模式.安全多播中密钥管理的研究为多媒体信息网络进行安全多播奠定了基础. 相似文献
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随着网络远程教育的不断发展，网络视频教育将占主导地位。用传统的单播或广播技术实现视频传送将耗尽带宽资源．而IP多播技术在多点视频数据传输方面具有很大的优势。本文在分析IP多播技术原理的基础上，主要讨论了IP多播技术在网络教学系统中的应用。 相似文献
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一种新的基于密钥树、XOR操作及单向函数的组密钥管理方案 总被引：2，自引：0，他引：2
在基于密钥树的组密钥管理方案中引入了XOR操作以及单向函数链,提出了一种新的基于密钥树、XOR操作以及单向函数链的组密钥管理方案,介绍了新方案中初始化、成员加入以及成员退出的操作,将新方案与3种基于密钥树的组密钥管理方案SKDC,LKH,OFT进行了比较,数据表明:就传输、计算以及存储开销而言,新的组密钥管理方案性能最优.分析了新方案的安全性问题,该方案能保证前向以及后向安全性:新加入的组成员不能获得以前的组播报文,而且即使任意多个退出组播组的组成员进行合谋也不能获得以后的组播报文. 相似文献
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提出了一种新的基于椭圆曲线密码体制的(t,n)动态秘密共享方案。该方案具有以下特点:参与者能自主选择子密钥;在进行一次秘密恢复后,不会泄露关于子密钥的任何信息,子密钥仍可用恢复于下一个共享的秘密;参与者的子密钥可定期更新,且更新工作由每个参与者独立完成。与传统的多秘密共享方案相比,该方案具有更高的安全性和灵活性。 相似文献
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基于Diffie-Hellman密码体制可验证的动态密钥托管方案 总被引：2，自引：0，他引：2
闫鸿滨 《南通职业大学学报》2009,23(1)
提出一个新的可验证动态密钥托管方案,其安全性基于离散对数与Diffie-Hellman问题的困难性假设,并分析了该方案的性能特点:(1)无需在用户与密钥托管者之间建立安全信道;(2)每个托管者的子密钥可以多次使用,因此在更新密钥时,不用更新每个托管者的子密钥;(3)系统可灵活增删成员;(4)可防止用户与密钥托管者的欺诈行为。由于其安全性和效率方面的特点,该方案可在密钥管理及电子商务中广泛应用。 相似文献
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组密钥更新是大规模动态群组安全尤其是互联网多播安全中的关键问题,批量密钥更新是高性能群组安全机制中的一个发展方向．研究批量密钥服务的排队模型,给出了问题的描述、批量服务的分类、模型,对其中的部分模型给出了稳态解,其结论对于批量密钥服务系统的设计具有理论指导意义． 相似文献
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IP多播技术在网络教学系统中的应用探究 总被引：1，自引：0，他引：1
随着网络远程教育的不断发展,网络视频教育将 占主导地位。用传统的单播或广播技术实现视频传送将耗尽 带宽资源,而IP多播技术在多点视频数据传输方面具有很 大的优势。本文在分析IP多播技术原理的基础上,主要讨论 了IP多播技术在网络教学系统中的应用。 相似文献
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在分析主流数据集成方法的基础上,结合我校数字化校园建设过程中的具体实践,提出了一种基于T-ETL的复合式数据集成方案,从而解决了各部门业务系统之间的数据互通问题。研究表明,该方案能保证数据的实时性,降低数据传输开销,消除数据交换中的性能瓶颈和安全隐患,提高了系统的整体性能。 相似文献
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刘莞 《福建工程学院学报》2009,7(3)
提出一种新的基于代理的系统--应用层自适应多播AALM系统,改善网络的异构性和传输实时性.在局域范围内采用高效率的IP multicaat进行数据传输,每个多播域中设置一个代理服务器MAN,MAN之间的主干网络通过应用层多播进行数据传输,实现在Internet范围内的多点数据通信.采用了XML驱动的服务定制机制,可以满足不同应用需求,节省大量的网络资源,提供网络吞吐量,提高视频服务质量. 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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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献
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唐芳 《读与写:教育教学刊》2008,5(6)
During interview with English majors, it was found that a majority of students expressed disappointment with their experience of English literature classes. Students' dislike of learning English literature appears to be the major problem of teaching English literature in China. Reader response approach is a good way to solve this problem. In this paper, I explain the rationale behind the reader response approach, such as its origin, definition, features, assumptions, and strategies. Then I illustrate how reader response approach works as a teaching strategy by presenting several teaching models. At last I evaluate its usefuiness for teachers and present the advantages of reader response approach in Chinese context. 相似文献