In this study, the critical factor of the chaos system has been analysed to improve the randomicity of the encryption keyspace. Several chaos systems have been integrated together with a linear function to form a much more efficient key sequence generator. This study also presents the cross colour field confusion method which scrambles the pixels among the R G B colour matrixes. In this way, the range of the pixels scrambling map is extended to three matrixes compared to the traditional pixels scrambling schemes which do pixels scrambling in its own colour matrix. The experiment results show that the improved cascade system has better bifurcation diagrams. The cross colour field diffusion algorithm makes the encrypted image has little pixel correlation and no information leakage. The experiment results justify that the novel cross colour confusion scheme with improved chaos systems has a good ability to resist brute force attack, known plain attack, chosen plain text attack, chosen ciphertext attack and differential attack. The security analysis demonstrates that the proposed approach has satisfactory properties in image encryption.

中文翻译：

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使用交叉色域算法和改进的级联混沌系统进行图像加密

在这项研究中，已经分析了混沌系统的关键因素，以提高加密密钥空间的随机性。几个混沌系统已与线性函数集成在一起，以形成效率更高的键序列生成器。这项研究还提出了交叉色域混淆方法，该方法将RGB颜色矩阵中的像素打乱。这样，与传统的像素加扰方案相比，像素加扰图的范围扩展到三个矩阵，传统的像素加扰方案在其自己的颜色矩阵中进行像素加扰。实验结果表明，改进后的级联系统具有更好的分叉图。交叉色场扩散算法使加密后的图像具有很少的像素相关性并且没有信息泄漏。实验结果证明，具有改进的混沌系统的新型交叉色混淆方案具有良好的抵抗蛮力攻击，已知的纯文本攻击，选择的纯文本攻击，选择的密文攻击和差分攻击的能力。安全分析表明，该方法在图像加密中具有令人满意的性能。