为了验证文献中提出的一种基于Logistic强混沌映射和陈氏超混沌系统的图像加密算法的安全性,对其进行了安全性分析,提出了适用于任意大小加密图像的已知明文攻击方法和选择明文攻击方法。同时,指出了原加密算法不安全的根本原因,并给出了提高其安全性的若干建议。
In order to verify the security of an image encryption algorithm based on Logistic chaotic map and Chen hyper-chaotic system proposed in literature, discussed security analyses of the algorithm and proposed the measures of known plaintext attacks and chosen plaintext attacks for random-sized encrypted images. Besides, pointed out the essential weakness of the algorithm and provided some suggestions to improve its security.