Correlation power analysis(CPA) has become a successful attack method about crypto-graphic hardware to recover the secret keys. However, the noise influence caused by the random process interrupts(RPIs) becomes an imp...Correlation power analysis(CPA) has become a successful attack method about crypto-graphic hardware to recover the secret keys. However, the noise influence caused by the random process interrupts(RPIs) becomes an important factor of the power analysis attack efficiency, which will cost more traces or attack time. To address the issue, an improved method about empirical mode decomposition(EMD) was proposed. Instead of restructuring the decomposed signals of intrinsic mode functions(IMFs), we extract a certain intrinsic mode function(IMF) as new feature signal for CPA attack. Meantime, a new attack assessment is proposed to compare the attack effectiveness of different methods. The experiment shows that our method has more excellent performance on CPA than others. The first and the second IMF can be chosen as two optimal feature signals in CPA. In the new method, the signals of the first IMF increase peak visibility by 64% than those of the tradition EMD method in the situation of non-noise. On the condition of different noise interference, the orders of attack efficiencies are also same. With external noise interference, the attack effect of the first IMF based on noise with 15dB is the best.展开更多
相关能量分析(Correlation Power Analysis,CPA)是主流的侧信道分析方法之一,其攻击成本较低廉,对密码设备有致命威胁。2020年,Bellizia等人提出了轻量级认证加密算法Spook,并声称算法抗侧信道攻击。但上述算法抵御CPA的能力有待分析。...相关能量分析(Correlation Power Analysis,CPA)是主流的侧信道分析方法之一,其攻击成本较低廉,对密码设备有致命威胁。2020年,Bellizia等人提出了轻量级认证加密算法Spook,并声称算法抗侧信道攻击。但上述算法抵御CPA的能力有待分析。基于Spook算法结构及其S盒实现特点,提出了一种CPA攻击方法:利用汉明重量模型刻画其运行时的功耗特征,将S盒输出值映射为假设功耗,并与真实功耗计算相关性,恢复出密钥。实验表明:当S盒采用查找表时,通过采集Clyde-128部件泄露的789条能量迹,可在1分钟内捕获主密钥。当攻击Shadow-512部件时,可恢复部分内部敏感信息,并能求解出相应的128比特明文。另外还分别对比了S盒层采用查找表和切片技术实现时上述算法的安全性能。实验表明在无防护时Spook无法抵御CPA攻击。展开更多
为了评估Piccolo密码算法的功耗分析安全性,该文提出一种针对Piccolo末轮的攻击模型,基于SASEBO(Side-channel Attack Standard Evaluation BOard)实测功耗数据对该算法进行了相关性功耗分析攻击。针对Piccolo末轮运算中包含白化密钥的...为了评估Piccolo密码算法的功耗分析安全性,该文提出一种针对Piccolo末轮的攻击模型,基于SASEBO(Side-channel Attack Standard Evaluation BOard)实测功耗数据对该算法进行了相关性功耗分析攻击。针对Piccolo末轮运算中包含白化密钥的特点,将末轮攻击密钥(包括轮密钥RK24L,RK24R,WK2,WK3)分成4段子密钥,逐个完成各个子密钥的攻击,使80位种子密钥的搜索空间从280降低到(2×220+2×212+216),使种子密钥的恢复成为可能。攻击结果表明,在实测功耗数据情况下,3000条功耗曲线即可恢复80位种子密钥,证实了该攻击模型的有效性和Piccolo硬件面向功耗分析的脆弱性,研究并采取切实有效的防护措施势在必行。展开更多
基金supported by The National Natural Science Foundation of China under Grants 61571063,61501100 and 61472357
文摘Correlation power analysis(CPA) has become a successful attack method about crypto-graphic hardware to recover the secret keys. However, the noise influence caused by the random process interrupts(RPIs) becomes an important factor of the power analysis attack efficiency, which will cost more traces or attack time. To address the issue, an improved method about empirical mode decomposition(EMD) was proposed. Instead of restructuring the decomposed signals of intrinsic mode functions(IMFs), we extract a certain intrinsic mode function(IMF) as new feature signal for CPA attack. Meantime, a new attack assessment is proposed to compare the attack effectiveness of different methods. The experiment shows that our method has more excellent performance on CPA than others. The first and the second IMF can be chosen as two optimal feature signals in CPA. In the new method, the signals of the first IMF increase peak visibility by 64% than those of the tradition EMD method in the situation of non-noise. On the condition of different noise interference, the orders of attack efficiencies are also same. With external noise interference, the attack effect of the first IMF based on noise with 15dB is the best.
文摘相关能量分析(Correlation Power Analysis,CPA)是主流的侧信道分析方法之一,其攻击成本较低廉,对密码设备有致命威胁。2020年,Bellizia等人提出了轻量级认证加密算法Spook,并声称算法抗侧信道攻击。但上述算法抵御CPA的能力有待分析。基于Spook算法结构及其S盒实现特点,提出了一种CPA攻击方法:利用汉明重量模型刻画其运行时的功耗特征,将S盒输出值映射为假设功耗,并与真实功耗计算相关性,恢复出密钥。实验表明:当S盒采用查找表时,通过采集Clyde-128部件泄露的789条能量迹,可在1分钟内捕获主密钥。当攻击Shadow-512部件时,可恢复部分内部敏感信息,并能求解出相应的128比特明文。另外还分别对比了S盒层采用查找表和切片技术实现时上述算法的安全性能。实验表明在无防护时Spook无法抵御CPA攻击。
文摘为了评估Piccolo密码算法的功耗分析安全性,该文提出一种针对Piccolo末轮的攻击模型,基于SASEBO(Side-channel Attack Standard Evaluation BOard)实测功耗数据对该算法进行了相关性功耗分析攻击。针对Piccolo末轮运算中包含白化密钥的特点,将末轮攻击密钥(包括轮密钥RK24L,RK24R,WK2,WK3)分成4段子密钥,逐个完成各个子密钥的攻击,使80位种子密钥的搜索空间从280降低到(2×220+2×212+216),使种子密钥的恢复成为可能。攻击结果表明,在实测功耗数据情况下,3000条功耗曲线即可恢复80位种子密钥,证实了该攻击模型的有效性和Piccolo硬件面向功耗分析的脆弱性,研究并采取切实有效的防护措施势在必行。
