In this paper, a new scrambling algorithm is proposed to reduce the correlation between the image pixels in three directions. In this paper, this algorithm is called ladder scrambling, and the image is scrambled multiple times in the form of diagonal lines. In terms of diffusion, DNA coding is used, and the secondary processing of the image is performed through DNA coding to change the pixel value of the image. The final encrypted image is affected by three conditions: the number of scrambling algorithms, the selection of DNA coding rules, and the key of the chaotic system. Theoretical analysis and experimental results show that the algorithm is safe and effective.

本文提出了一种新的加扰算法，以减少三个方向上图像像素之间的相关性。在本文中，该算法称为梯形加扰，并且图像以对角线的形式被加扰多次。在扩散方面，使用DNA编码，并且通过DNA编码执行图像的二次处理以改变图像的像素值。最终的加密图像受以下三个条件的影响：加扰算法的数量，DNA编码规则的选择以及混沌系统的密钥。理论分析和实验结果表明该算法是安全有效的。