在抗功耗分析的实际应用中,随机时间片作为一种常见的对抗方法,具有安全性高和开发成本低的优点.本文针对现有随机时间片下的攻击方法普遍具有的复杂度较高,以及通用性较低的问题,提出两种新型的PA(power analysis)攻击方法,即当量法和相关性法.这两种方法分别通过对不同单位周期的功耗以及相关性的比较对功耗曲线进行分析,以较小的代价确定目标轮次所在位置,并对曲线进行对齐操作,实现有效的功耗分析.与已有攻击方法的比较,以及实验结果均表明这两种攻击方法能以较低分析复杂度和较少分析样本,对工业级密码芯片中普遍采用的以时钟周期为插入单位的随机时间片对抗方法进行有效攻击. In the practical application of anti-power analysis, random time slice as a common method of confrontation has the advantages of high security and low development cost.In this paper, the existing random time slice attack method generally has a high degree of complexity , As well as the problems of low universality, two new PA (power analysis) attack methods are proposed, namely the equivalent method and the correlation method, which compare the power consumption and the correlation of different unit periods The curve of consumption is analyzed, the location of the target round is determined at a small cost, and the curve is aligned so as to achieve effective power analysis. Comparing with the existing attack methods and the experimental results show that these two attack methods can With the lower analysis complexity and less analysis samples, the random time slice confrontation method, which is commonly used in the industrial-grade cryptographic chips and uses the clock cycle as the insertion unit, is effectively attacked.