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中文摘要：
对CHES 2011会议提出的轻量级分组密码LED抗功耗模板攻击能力进行了评估，从功耗曲线预处理优化的角度对模板攻击提出了改进：利用功耗曲线频域上的相位相关性计算偏移量，消除了模板构建过程中的数据干扰；利用明文片段对功耗曲线聚类划分的特征差异，提出了一种基于类间距离的特征提取方法，可实现不同泄露点的功耗数据自动切割；利用均值和噪声信息评估模板区分度，提出了一种基于聚类有效度的动态选点策略，提高了旁路信息利用率。实验结果表明：数据对齐和切割提高了匹配度的区分效果，降低了模板构建和攻击所需功耗曲线数量；聚类有效度选点策略与现有策略相比，攻击数据复杂度低，2条功耗曲线即可使成功概率收敛于1。
英文摘要：
The security of LED, a lightweight block cipher proposed in CHES 2011, was evaluated by the template attack （TA）. Several improvements of TA from the perspective of the preprocessing optimization was proposed. Firstly, the noise offset was calculated by using the phase-only correlation factor in the frequency view of the power trace to elimi-nate the data interference in the template building phase. Secondly, a novel character extracting method was proposed based on calculating the cross-cluster offset of different clusters classified by the plaintexts to cut the different leakage points from the power traces automatically. Thirdly, a dynamic effective power points choosing strategy was proposed by utilizing the mean value and the noises of the of power traces to evaluate the differences between different templates and im-prove the utilization of side channel information. Experiment results demonstrate that the proposed techniques of data align-ment and automatically data cutting enlarge the differences of templates and reduce the number of the required power trace in both the template building and attacking phase. The proposed effective power points choosing strategy reduces the data complexity of the attack and only two power traces are required to launch the attack with the success rate of 100%.
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