计算机科学 ›› 2018, Vol. 45 ›› Issue (4): 178-181.doi: 10.11896/j.issn.1002-137X.2018.04.030
朱淑芹,王文宏,李俊青
ZHU Shu-qin, WANG Wen-hong and LI Jun-qing
摘要: 对一种基于感知器模型的混沌图像加密算法进行了安全性分析,发现该算法的本质就是根据等效密钥流来改变明文图像像素值的比特位,从而得到密文图像。而等效密钥流与明文图像和对应的密文图像没有任何关系,因此运用选择明文攻击的方法破解出了算法中的等效密钥流,解密出了目标明文图像;同时指出了原算法存在的另外两个安全缺陷;最后对原算法进行了改进,弥补了其缺陷。理论分析和实验结果均证实了所提出的选择明文攻击策略的可行性以及改进算法的有效性。
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