Arnold双置乱图像加密算法

Image encryption algorithm based on double scrambling of Arnold transformation

为提升图像的置乱效果和置乱性能,提出了一种基于Arnold变换的双置乱图像加密算法.对原始图像进行分块来削弱图像邻域像素的相关性,对每块图像进行Arnold位置置乱来消除图像块的空间相关性,对整幅图像进行Arnold像素值置乱来消除图像的色彩相关性.研究结果表明:本算法不仅能取得更好的加密效果,而且能够有效地抵御局部随机裁剪攻击.该算法对图像加密的研究与应用具有一定的参考价值和指导意义.

To enhance the effect and performance of image scrambling, a kind of double scrambling algorithm of Arnold transformation was put forward. Firstly, the uniform block operation of original image was carried out to weaken the image correlation between adjacent pixels effectively. Secondly, to weaken the image spatial correlation scrambling algorithm shuffled the pixels' position of each blocks by using Arnold. Lastly, scrambling algorithm shuffled the pixels' value of the whole image to weaken the image color correlation by using Arnold. The experimental results show that this algorithm can not only achieve better encryption result, but also have strong ability against shearing. The algorithm has reference value and guiding significance in the aspect of the research and application of image encryption.