This study presents a novel encryption method for the security of DICOM (Digital Imaging and Communications in Medicine) images used in medical applications. The proposed algorithm splits the original image into blocks of size 16 × 16 pixels, then encrypts it through three steps. Firstly, the keys k ₁ , k ₂ , k ₃ and k ₄ are transformed from four vectors of 16 pixels to a matrix of 16 × 16 pixels. Then, the proposed algorithm encrypts the image block-by-block using the Vigenère cipher algorithm. For each block, the proposed algorithm modifies the key using Arnold transform. The proposed encryption algorithm is scalable with colour images and JPEG (Joint Photographic Experts Group) compression. The cryptanalysis of the proposed algorithm demonstrates that it passed the cryptography attacks tests with success. Its running time shows that it is faster than a typical and recent image encryption algorithm.

中文翻译：

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使用Arnold变换和Vigenère密码通过新的加密算法保护DICOM图像

这项研究提出了一种用于医学应用的DICOM（医学数字成像和通信）图像安全性的新型加密方法。提出的算法将原始图像分割为16×16像素大小的块，然后通过三个步骤对其进行加密。首先，键ķ ₁ ，ķ ₂ ，ķ ₃和ķ _图4的图像从四个16像素的矢量转换为16×16像素的矩阵。然后，提出的算法使用Vigenère密码算法逐块加密图像。对于每个块，所提出的算法使用Arnold变换修改密钥。所提出的加密算法可通过彩色图像和JPEG（联合图像专家组）压缩进行扩展。该算法的密码分析表明，该算法成功通过了密码学攻击测试。它的运行时间表明，它比典型的最新图像加密算法要快。