AES加密算法的实现及应用

AES加密算法具有安全性高,运行速度快,对硬件配置要求低,属于对称算法等优点,非常适合硬件的实现.本文对AES加密算法进行了改进,研究了AES加密算法的C语言实现以及数据流的加密和解密过程,同时对AES加密算法的应用进行了简单介绍.     

AES加密算法的实现

讨论并分析了高级加密算法AES,并在PC机上实现了其算法,最后对AES算法作了简单的评价。     

基于AES加解密系统的设计与实现

基于Windows XP操作系统,利用VC++编程语言,实现了一个基于AES的加解密系统,该系统能对字符串和文件使用AES算法进行正确的加密和解密。     

基于AES和RSA的数据加密技术方案

研究目前主要的一些数据加密算法:DES,RSA以及高级加密标准(AES)的Rijn-dael算法.在比较AES算法和RSA算法基础上,结合AES算法的效率高以及RSA算法中密钥产生和管理的方便性等特点,将AES与RSA相结合提出了一种新的综合加密技术方案.     

基于流水线结构的可重构AES算法IP核的硬件实现(英文)

为了提高AES算法中IP核数据的吞吐量并同时减小硬件资源的占用,以达到速度和面积的折中实现,采用混合流水线结构和可重构技术完成了IP核的设计.该设计包括在同一个混合流水线结构的流程中实现了AES算法的加密和解密过程;根据有限域的性质,对AES算法中的Sbox盒进行了优化;结合可重构技术,完成了对AES轮变换的主要构件ShiftRow和MixColumn的优化.本设计在Xilinx Virtex2p xc2vp20-7 FPGA器件上完成,其数据吞吐量达到2.58Gbit/s,所需组合逻辑仅为3 233块,通过与同型号器件上的其他设计进行对比,实现了速度和面积的折中,在吞吐量和面积上都得到了比较理想的结果.     

基于AES算法的文件加密

介绍AES算法的基本理论,并应用到具体软件实现中。在AES算法实现中,预先存储正反S盒查找表,提高算法执行的运行速度;使用密文挪用技术,解决待处理数据长度不是分组长度整数倍的问题;提出优化文件读写方案,使用多线程和缓存技术,提高系统加密解密的吞吐量。测试加密软件的基本功能,并对软件性能作量级测试。     

智能卡的AES算法差分能量分析仿真

分析了高级加密标准(AES)算法易于受到DPA攻击的环节,使用PINPAS工具分别对采用原始AES算法和改进AES算法的仿真智能卡做了DPA攻击测试,并分析了其测试结果。     

高级加密标准AES实现

讨论并分析了高级加密标准AES,在PC机上实现了其算法并进行相关性能测试.     

DES与AES的比较研究

讨论了目前主要的一些数据加密算法、DES算法及高级加密标准(AES)的Rijndael算法。比较了DES、AES对称密码算法,得出AES具有比DES更好的安全性、效率、灵活性的结论。     

AES算法研究

密码技术是信息安全的核心技术,本文主要通过阐述AES的算法原理与步骤,特点及安全性,以实现密码技术,增强信息安全.     

A Brief Introduction to AES

This essay first gives a brief introduction to AES systems and the main approaches employed by AES,then talks about AES’limitations and recent development,and finally discusses the pros and cons on it.By reviewing previous literature,this paper intends to provide a brief picture of AES systems for Chinese researchers,in the hope that they will learn from foreign examples and succeed in building a valid AES system for learners at home.     

On the relation between automated essay scoring and modern views of the writing construct

This paper examines the construct measured by automated essay scoring (AES) systems. AES systems measure features of the text structure, linguistic structure, and conventional print form of essays; as such, the systems primarily measure text production skills. In the current state-of-the-art, AES provide little direct evidence about such matters as strength of argumentation or rhetorical effectiveness. However, since there is a relationship between ease of text production and ability to mobilize cognitive resources to address rhetorical and conceptual problems, AES systems have strong correlations with overall performance and can effectively distinguish students in a position to apply a broader writing construct from those for whom text production constitutes a significant barrier to achievement. The papers begins by defining writing as a construct and then turns to the e-rater scoring engine as an example of AES state-of-the-art construct measurement. Common criticisms of AES are defined and explicated—fundamental objections to the construct measured, methods used to measure the construct, and technical inadequacies—and a direction for future research is identified through a socio-cognitive approach to AES.     

Appraising the scoring performance of automated essay scoring systems—Some additional considerations: Which essays? Which human raters? Which scores?

ABSTRACT

The literature on Automated Essay Scoring (AES) systems has provided useful validation frameworks for any assessment that includes AES scoring. Furthermore, evidence for the scoring fidelity of AES systems is accumulating. Yet questions remain when appraising the scoring performance of AES systems. These questions include: (a) which essays are used to calibrate and test AES systems; (b) which human raters provided the scores on these essays; and (c) given that multiple human raters are generally used for this purpose, which human scores should ultimately be used when there are score disagreements? This article provides commentary on the first two questions and an empirical investigation into the third question. The authors suggest that addressing these three questions strengthens the scoring component of the validity argument for any assessment that includes AES scoring.     

基于AES的大学英语写作教学模式研究

英语写作能力培养一直是大学英语教学的重点和难点,目前自动作文评分AES（Automated Essay Scoring）技术已得到广泛应用,但如何将其与大学英语写作教学有效结合仍有待深入研究。鉴于此,根据我国大学英语写作教学现状,结合L2（Second Language）语言学习特点,在分析AES技术相关原理基础上,对大学英语写作教学模式进行分析研究。结果表明,当前中国大学英语写作教学需结合AES技术和L2语言学习特点,构建基于AES的大学英语教学模式,以激发学生学习兴趣,提升学生英语写作能力。     

英语作文自动评分及其效度、信度与可操作性探讨

评述国内外作文自动评分系统,并依据英语作文测试中的信度、效度和实践可操作性对其进行分析。探讨国内英语作文自动评阅系统的发展,在肯定其优点的同时,指出和分析其中的问题和不足,并提出相应之对策,以期为我国英语作文自动评阅系统研发提供借鉴和启迪。     

Novel Frequency Hopping Sequences Generator Based on AES Algorithm

A novel frequency hopping(FH) sequences generator based on advanced encryption standard(AES) iterated block cipher is proposed for FH communication systems.The analysis shows that the FH sequences based on AES algorithm have good performance in uniformity, correlation, complexity and security.A high-speed, low-power and low-cost ASIC of FH sequences generator is implemented by optimizing the structure of S-Box and MixColumns of AES algorithm, proposing a hierarchical power management strategy, and applying the dynamic clock gating technology based on finite state machine and clock gating.SMIC 0.18 μm standard CMOS technology shows that the scale of ASIC is only about 10.68 kgate, power consumption is 33.8 μW/MHz, and the maximum hop-rate is 1 098 901 hop/s.This design is suitable for portable FH communication system for its advantages in high-security and hop-rate, low-power and low-cost.The proposed FH sequences generator has been employed in Bluetooth SoC design.     

高级加密标准的密钥线性特征及相关性分析

高级加密标准(AES)的应用越来越广泛,因此它的安全性成为很多学者的研究课题,其中一个很重要的研究方向就是通过AES的密钥特征来攻击该方法。本文重点分析了AES密钥编排的线性特征及其相关性,同时给出了一种利用相关密钥来攻击AES的思路。本文中的分析结果将会为后面的多轮差分分析,相关密钥的差分分析,相关密钥的不可差分分析提供理论的依据。