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公钥密码体制的算法大多基于有限域的幂指数运算或者离散对数运算。而这些运算一般会采用Montgomery算法来降低运算的复杂度。针对Montgomery算法本身存在可被侧信道攻击利用的信息泄露问题,从理论和实际功耗数据2方面分析了Montgomery算法存在的安全漏洞,并基于该漏洞提出了对使用Montgomery算法实现的模幂运算进行简单能量分析(SPA, simple power analysis)攻击算法。利用该算法对实际模幂运算的能量曲线进行了功耗分析攻击。实验表明该攻击算法是行之有效的。 相似文献
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现有基于SM3的HMAC的能量攻击方法,仅适用于同时存在汉明重量和汉明距离信息泄露的攻击对象,如果被攻击对象存在单一模型的信息泄露,则这些方法均不适用。针对该局限性,提出了一种针对SM3的HMAC的能量分析新型攻击方法,该新型攻击方法每次攻击时选择不同的攻击目标和其相关的中间变量,根据该中间变量的汉明距离模型或者汉明重量模型实施能量分析攻击,经过对SM3密码算法的前4轮多次实施能量分析攻击,将攻击出的所有结果联立方程组,对该方程组求解,即可推出最终的攻击目标。通过实验验证了该攻击方法的有效性。由于所提方法不仅可以对同时存在汉明重量和汉明距离信息泄露的对象进行攻击,而且还可以对仅存在单一信息泄露模型的对象进行攻击,所以该方法应用的攻击对象比现有的攻击方法应用更广。 相似文献
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The power analysis attack on SM4 using the chosen-plaintext method was proposed by Wang et al in 2013 CIS.The fixed data was introduced in the method when attacking the round key.However,the attack process was complex.There were many problems in the process,such as more power traces,more numbers of the chosen-plaintext and acquisition power traces.The correlation between the fixed data and the round key were presented,which could be used to decode the round key.Based on the correlation,the improved chosen-plaintext power analysis attack against SM4 at the round-output was proposed.The proposed method attacked the fixed data by analyzing the power traces of the special plaintext.And the round key was derived based on the correlation.The results show that the proposed attack algorithm is effective.The proposed method not only improves the efficiency of the attack by reducing number of power traces,number of the chosen-plaintext and number of acquisition power traces,but also can be applied to a chosen-plaintext power analysis attack against SM4 at the shift operation. 相似文献
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