共查询到20条相似文献，搜索用时 343 毫秒
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随着计算机和通信技术的发展,用户对信息的安全存储、安全处理和安全传输的需求越来越迫切,随着攻击手段的日益提高和计算机计算速度的增长,原有的DES密码体制由于密钥长度太短,无法满足需要的安全强度。最新的密码体制AES具有简洁、实现速度快、安全性高等优点,是分组密码加密体制的一个相当好的标准。随着AES的确定,分组密码算法的研究越来越受到人们的重视。分组密码具有速度快、易于标准化和便于软硬件实现等特点,通常是信息与网络安全中实现数据加密、数字签名、认证及密钥管理的核心体制,它在计算机通信和信息系统安全领域有着最广泛的应用。本文重点介绍了高级加密标准算法,研究分析了AES加密和解密原理。 相似文献
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混沌序列具有类随机性、对初始条件极度敏感性、遍历性和非周期性等特点,展现出优良的密码学性能。该加密算法通过Logistic映射产生混沌序列,并将混沌序列映射为64位二进制序列,结合DNA序列变迁重组算法和DES算法对64位明文分组进行加密,DES初始密钥处于动态变化中,能有效地抵御穷举攻击和选择密文攻击等多种攻击手段。 相似文献
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电子商务中的数据加密技术 总被引：6，自引：0，他引：6
叙述了数据加密系统的组成，比较了对称密钥加密体制和公开密钥加密体制的优,工得出在电子商务中采用混合密钥加密体制，既保证了数据安全，又提高了加密和解密速度。 相似文献
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在计算机网络中,为了保证数据的保密性和可靠性,需要对数据进行加密与解密。本文先介绍了Hill密码算法,指出Hill密码密钥矩阵即剩余阵的逆矩阵存在的充要条件,最后较详细讨论了求剩余阵的逆矩阵的算法及其Matlab程序,从而可通过Hill密码对信息进行快速加密与解密,实现用户信息安全保护。 相似文献
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基于RSA和高级数据加密标准的网络数据加密方案 总被引：1，自引：0，他引：1
阐述了公开密钥密码技术RSA算法和最新的数据加密标准AES,利用AES算法的效率以及DES算法中密钥产生和管理的方便性等特点。并将两者结合起来,提出了一种新的网络数据加密方案,该网络数据加密方案可以有效地解决数据在网络传输中的保密性等问题。 相似文献
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现代密码技术在保证信息安全中起着至关重要的作用。SM4算法运算速度快,但存在密钥管理复杂并且安全性低的缺点;SM2算法安全性高、密钥管理简单,但存在对大块数据加解密速度慢和效率较低的缺点。提出一种基于SM4和SM2算法的混合加密算法,大量的主体明文数据采用加密速度极快的SM4算法,利用SM2算法加密SM4算法的密钥并和密文一起传输来避免SM4复杂的密钥管理,提高了数据安全性。经理论分析及在同方THD86芯片上的实验验证,该算法方便可行,加密、解密速度快且安全性高,在电子商务和电子政务中的应用具有良好的效果。 相似文献
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本文介绍了现代加密技术中Rijndael算法和DES算法,并针对这两种算法都具有高速加密文件的特点,提出了基于Rijndael算法与DES算法两种加密技术结合的双重联合加密文件保护方案,并介绍了在.NET框架调用RijndaelManaged类与DESCryptoServiceProvider类实现了双重联合加密/解密文件的方法。 相似文献
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Among the galaxy of research development organizations in northwest Beijing's Zhongguancun district known as China's Silicon Valley two are especially well-known to IT researchers: Microsoft Research Asia 《中国科学院院刊(英文版)》2008,22(1):47-49
Among the galaxy of research and development organizations in northwest Beijing＇s Zhongguancun district, known as China＇s Silicon Valley, two are especially well-known to IT researchers： Microsoft Research Asia （MSRA）, and, within a few blocks on the other side of the street, the CAS Institute of Automation （CASIA）. While most people in Chinese scientific organizations strive to move to a large foreign counterpart, Dr. Stan Z. Li （LI Ziqing） moves against the stream. 相似文献
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The research into the origins of domestic animals is of significance not only for understanding their development per se but also for making clear the human society evolution. Although there are evidences to show that pigs were independently domesticated in a variety of places throughout the world the detailed scenario of the origin dispersal of domestic pigs in East Asia remains unclear.…… 《中国科学院院刊(英文版)》2008,22(1):7-7
The research into the origins of domestic animals is of significance not only for understanding their development per se, but also for making clear the human society evolution. Although there are evidences to show that pigs were independently domesticated in a variety of places throughout the world, the detailed scenario of the origin and dispersal of domestic pigs in East Asia remains unclear. 相似文献
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《中国科学院院刊(英文版)》2008,22(1):13-14
Aresearch project on the greenhouse cultivation of Swertia chirayita Buch Ham, a popular herbal drug used by the Tibetan people against liver and gallbladder diseases, recently passed the acceptance check by a panel of experts under the auspices of Qinghai Provincial S＆T Bureau. The feat was accomplished by researchers from the Lanzhoubased CAS Northwest Institute of Plateau Biology. 相似文献
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《中国科学院院刊(英文版)》2008,22(1):58-58
As a key component of the national initiative for basic S＆T data and infrastructure development, a nationwide survey on the lake water quality, volume and bio-resources has recently been kicked off. The move marks the systematic implementation of the secondround investigation of the country＇s lacustrine resources. 相似文献
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Bats the only mammals known to possess the real ability to fly have fascinated zoologists for a long time with their long-distance migration. How do they find their way home from an altitude of kilometers above sea level where their stunt of ultrasonic echolocation does not work?…… 《中国科学院院刊(英文版)》2008,22(1):3-4
Bats, the only mammals known to possess the real ability to fly, have fascinated zoologists for a long time with their long-distance migration. How do they find their way home from an altitude of kilometers above sea level, where their stunt of ultrasonic echolocation does not work？ Recent discoveries supported the theory that bats might be able to use magnetic clues to figure out their own position,just like what birds do. However, the latest results from a joint study by a group of researchers from the CAS, East China Normal University and University of Auckland reveal that bats apply an interesting strategy different from the one underlying birds＇ orientation technique, though they both are believed to derive information about their position from the subtle changes in the magnetic field of the Earth. 相似文献
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《中国科学院院刊(英文版)》2014,(3):252-252
<正>On February 12,2014,the international academic journal Cancer Research published an article online entitled"Latency Associated Nuclear Antigen of Kaposi's Sarcoma Associated Herpesvirus Promotes Angiogenesis through Targeting Notch Signaling Effector Hey1",as a result from the research conducted by Prof.LAN Ke’s lab at the Institut Pasteur of Shanghai,Chinese Academy of Sciences. 相似文献
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SONG Jianlan 《中国科学院院刊(英文版)》2014,(3):217-220
<正>Scientists from CAS and the Max Planck Society(MPG)met on May 13,2014 in Beijing to celebrate their four-decade-long ST cooperation and cherished friendship,anticipating further development of the bilateral relation.This partnership formally began four decades ago with a visit paid by then MPG President,Prof.Lüst to CAS,introduced CAS President BAI in his address at the celebration:"During the visit,CAS and MPG confi rmed the basic principles of cooperation,that is equality and mutual benefi ts for both sides,and reached agreement to develop a collaborative partnership."This occurred only two years after the establishment of the diplomatic relations between Germany and China,despite the shadow of the Cold War."Building up a partnership between Germany and 相似文献
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TANG Kun 《中国科学院院刊(英文版)》2014,(2):161-165
<正>The scientifi c goals of the Partner Group are to utilize large scale genomic polymorphism data to make fi ne inferences about human demographic history and various forms of natural selection in the human genome;and to understand the genetic basis and evolutionary mechanisms underlying the common variations in human facial morphology,both within and between populations. 相似文献
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Frauke Gr?ter 《中国科学院院刊(英文版)》2014,(2):195-197
<正>The Group on Protein Mechanics and Evolution at the CAS-MPG Partner Institute for Computational Biology,Shanghai,was established in January 2007 and headed by Dr.Frauke Gr?ter.The Klaus Tschira Lab has continued the eff orts of this former Independent Junior Research Group,since Dr.Gr?ter took up a position at the Heidelberg Institute of Theoretical Studies(HITS)in Heidelberg,Germany,in 相似文献
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ALEXER STIRN 《中国科学院院刊(英文版)》2014,(2):150-153
A material can't get any thinner. Graphene consists of just one layer of carbon atoms but that‘s not the only reason materials scientists are interested in this material: they‘re fascinated primarily by its extraordinary properties. ZHI Linjie and his Partner Group of the Max Planck Institute for Polymer Research are using chemistry to optimize graphene for various applications. 相似文献