Preparation and properties of the SmOx/Rh(100) model surface

The preparation of SmO_x/Rh(100) and CO adsorption on this model surface have been investigated with Auger electron spectroscopy (AES), X-ray photoelectron spectroscopy (XPS) and temperature programmed desorption spectroscopy (TDS). The oxygen adsorption on the SmRh alloy surface leads to the aggregation of Sm on the surface. The thermal treatment of this oxidized surface induces the further agglomeration of SmO_x on the Rh(100) surface. Compared with CO TDS on the clean Rh(100) surface, three additional CO desorption peaks can be observed at 176, 331 and 600 K on the SmO_x/Rh(100) surface. The CO desorption peak at 176 K may originate from CO adsorbed on SmO_x islands, while the appearance of the CO adsorption peaks at 331 and 600 K, depending on the oxidation state of Sm, is attributed to CO species located at the interface of SmO_x/Rh(100).     

AES密码盒算法的详细实现过程及其应用

详细阐述了AES算法的核心之一——密码盒的详细实现过程，对实现过程中各环节的算法设计思想作了深入细致的介绍，提出了多项式求逆、相乘、相除(对于不可约多项式模)的算法思想，并且所有关于多项式的算法思想全部用C语言实现过，结论完全正确。旨在为吸取AES算法的精华、进一步推广使用有关多项式的算法提供参考和给予启迪。     

Chemical components and microtopography of （100） surface for orthopyroxene

XPS and AES depth composition profile studies were carried on to understand chemical components of (100) surfaces for Chengde hypersthene from Hebei Province, China, and Bamble enstatite from Norway. Also, to understand the microtopography of them the AFM observation was carried on. There are obvious differences between chemical components of (100) surface and those of mineral inner. Compared with inner mineral Si^4 proportion in total cations has no distinguished variation, whereas Ca^2 and Al^3 proportions increase respectively, and Mg^2 proportion decreases. AES depth composition prof‘de of 2000s shows that at a depth of 70 nm the atomic concentrations (%) for each element (except Si in Chengde hypersthene) slightly go up and down, but the average values have no obvious change. On the profile, the atomic concentrations (%) of Al and Si for Chengde hypersthene present a compensated relationship. Obviously, the Si and Al must have the relationship of isomorphic replacement on the (100) surface. The image of AFM shows that there is hillock growth on the (100) surface in the layered form of the polygon with 0 to several hundreds nm in thickness. The growth is a sort of secondary phyllosilicate minerals. The observation of the above-mentioned phenomenon and the recognition on the above regularities are benefit for understanding of the mechanism for weathering and water-rock reactions.     

AES加密算法在无线网络安全中的应用

1.引言随着WLAN的不断发展,它的安全问题不断受到广泛的关注.近年来,国内外的研究,一个是以密码学理论为基础的各种数据加密算法E另一个是以计算机网络为背景的网络信息安全传输模型的研究。其中密码学算法已经在实际应用中取得非常好的效果F而后者尚在理论探索阶段。2000年10月2日,由比利时设计者Joan Daemen和Vincent Rijmen设计的Rijndael算法以其优秀的性能和抗攻击能力,成为新一代的加密标准AES,从此一种更高效的算法将为我们服务在各个领域。     

石油焦灰分中金属含量的测定

首次采用等离子体发射光谱仪对石油焦中的多种金属元素进行测定，说明了石油焦灰分的主要来源，方法准确可靠，具有实际应用价值。     

针对FPGA实现的AES密码芯片的相关性电磁分析攻击

通过研究相关性电磁分析(CEMA)攻击方法, 构建电磁泄漏信息采集和数据处理平台, 对基于现场可编程门阵列(FPGA)实现的AES-128密码算法进行近场相关性电磁分析攻击。攻击结果表明, 该平台能够获取密码芯片工作时的电磁泄漏信息,并通过分析获取AES第10轮加密的全部16个字节密钥。经过优化数据处理, 相关性电磁分析攻击的效率得到很大提高, 攻击所需的数据组数大大下降。     

一种针对FPGA密码模块的非侵入式故障攻击

在FPGA平台上, 利用降低电源电压的方法使电路关键路径上的数据建立失败, 从而达到注入故障的目的。基于合适的故障模型, 攻击者可以有效地获取密钥信息,实现了针对密码模块的高效率、低成本的非侵入式故障攻击方法。攻击实验利用一台电压源和一台个人电脑, 通过8组正确和错误密文对, 成功地恢复出一个FPGA 中AES密码模块的128 bit完整密钥。     

一种基于混沌的AES算法的研究

AES算法越来越多地应用到各个领域,是加密方法发展的新趋势.描述了AES加密算法,重点是对AES算法进行了改进,即用Logistic映射生成的混沌序列作为AES加密方法的初始密钥.最后用C++语言实现了混沌和AES结合的新算法并与原始AES算法进行了速度对比.     

基于数字水印和ECC的电子印章系统

在PKI模型下结合椭圆曲线公钥体制下的数字签名算法(ECDSA)、数字水印技术、USBKey技术实现电子印章系统.ECC算法和AES算法的结合为电子印章提供更高的安全性,同时为电子印章在无线环境中应用提供扩展支持.     

适用于超高频RFID无源标签的AES算法实现

分析了用于高安全性应用的EPC Gen2电子标签对安全算法实现的约束,在此基础上提出了一种AES算法的低功耗硬件实现方案.该方案中采用了单S盒设计,使用同一个数据通路实现了加密和解密的流程,减小了硬件资源开销.仿真结果表明电路总的门数为4 952门,可以在204个时钟周期内完成128 bit数据的加密或解密,满足安全标签的设计需求.