该文以密码芯片的功耗泄漏机理为基础,研究了简单功耗分析攻击理论,并以RSA密码算法为目标,进行了针对RSA密码算法的简单功耗分析实验,验证了简单功耗分析对于破解RSA密码算法的可行性,最后,提出了基于随机扫描的掩模模幂算法作为抵御简单功耗分析的防护措施.“,”This paper has investigated the theory of the simple power, based on the power consumption of cipher chip. And taking the RSA cipher algorithm as goal, the paper has finished the experiment of the simple power analysis attack. In the last paragraph, the paper proposes a randomized masking method as countermeasure.