共查询到18条相似文献,搜索用时 93 毫秒
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面向NFC应用的DES/3DES算法研究与仿真实现 总被引:1,自引:0,他引:1
在分析DES/3DES密码算法及常用抗攻击策略的基础上,从DES算法的功耗点和代码的简易程度着手,进一步改进掩膜方法,提出了一种抗DPA攻击的DES/3DES改进算法,该算法可支持ECB和CBC工作模式.利用SystemC建立算法模型并进行验证,完成了满足NFC应用要求的DES/3DES密码协处理器的设计和仿真;建立了一套SystemC算法模型和RTL电路自动仿真系统,以减少开发周期及研发成本.对改进算法及电路所做的仿真验证了电路的有效性. 相似文献
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DES算法的高速流水线实现 总被引:7,自引:0,他引:7
文章介绍了密码算法DES,分析了DES算法适用流水线实现的特点。并在此基础上介绍了一种流水线式高速实现DES加密解密的方法,这一算法同样可以应用于3-DES。 相似文献
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针对DES加密系统中的差分功耗攻击,提出基于MASK的改进DES_DPA算法,并以此为基础设计了DES_DPA硬件。通过对DES中每轮运算中的子密钥掩码,改变运算过程中晶体管的翻转率,使得功耗曲线的特征随之改变,硬件设计只需增加两个MASK子电路即可实现DES_DPA算法。基于0.25/μm库,DES_DPA模块的综合规模为1914门,最大延时为9.57ns,可工作于100MHz。 相似文献
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本简要地介绍了DES的由来和工作原理,同时给出了差分密码的分析方法,并在此基础上以6轮为例论述了如何利用差分分析方法实现DES的密码分析。 相似文献
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采用DES线制作PCB外层线路时,线宽精度影响因素主要有表面铜厚度及铜厚均匀性、蚀刻均匀性/稳定性、线路密集程度差异、菲林补偿差异等。首先对DES线设备、工艺参数优化;其次在设备参数正常条件下研究发现当表面铜厚均匀性相同时,表面铜厚越厚则线宽差距越大,即铜厚每相差10 m则线宽相差10 m~20 m;然后深入研究发现68.6 m表面铜厚的密集线、孤立线线宽差异约25.4 m。最后确立密集线、孤立线差异的消除方法为"引入Genesis2000的动态蚀刻补偿功能对菲林补偿优化";并通过批量验证其补偿法则是准确的及使用该软件是可行的、有效的,提高了酸性蚀刻制作外层减成法板线宽精度。 相似文献
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Eli Biham 《Journal of Cryptology》1998,11(1):45-58
In recent years, several new attacks on DES were introduced. These attacks have led researchers to suggest stronger replacements
for DES, and in particular new modes of operation for DES. The most popular new modes are triple DES variants, which are claimed
to be as secure as triple DES. To speed up hardware implementations of these modes, and to increase the avalanche, many suggestions
apply several standard modes sequentially. In this paper we study these multiple (cascade) modes of operation. This study shows that many multiple modes are much weaker than multiple DES, and their strength
is theoretically comparable to a single DES.
We conjecture that operation modes should be designed around an underlying cryptosystem without any attempt to use intermediate
data as feedback, or to mix the feedback into an intermediate round. Thus, in particular, triple DES used in CBC mode is more
secure than three single DESs used in triple CBC mode. Alternatively, if several encryptions are applied to each block, the
best choice is to concatenate them to one long encryption, and build the mode of operation around it.
Received 15 February 1996 and revised 30 May 1996 相似文献
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The paper presents the design of multiband frequency selective surfaces (FSS) using the differential evolution strategy (DES) cum equivalent circuit method (ECM). Two examples are demonstrated to design a dual-band gridded-square and a triple-band gridded-double-square array respectively. Good agreements are obtained between the simulation results and experimental results. The good results under very short computational time and none trial-and-error procedure demonstrate the feasibility of the proposed method. 相似文献
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可重构密码芯片提高了密码芯片的安全性和灵活性,具有良好的应用前景.然而目前的可重构密码芯片吞吐率均大大低于专用芯片,因此,如何提高处理速度是可重构密码芯片设计的关键问题.本文分析了常用对称密码算法DES、3DES和AES的可重构性,利用流水线、并行处理和可重构技术,提出了一种可重构体系结构.基于该体系结构实现的DES、3DES和AES吞吐率在110MHz工作频率下分别可达到7Gbps、2.3Gbps和1.4Gbps.与其他同类设计相比,本文设计在处理速度上有较大优势,可以很好地应用到可重构密码芯片设计中. 相似文献
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