基于单一像素值改变的图像置乱新算法

摘要

Aiming at the safe problem of digital image transmission, this paper presented a new image scrambling algorithm based on changing the pixel values. The algorithm improved the Vigenere encryption algorithm, made it can be applied in the digital image encryption. Experimental result shows that, the image which is encrypted by this algorithm has a high safety, compared with the traditional image scrambling algorithm based on changing the single pixel. The method has a better ability of resist noise, it also has better flexibility, it can encrypt any size of digital images. The scrambling degree of the encrypted image has the close relationship with the choice of keyword, and it can encrypt any size of digital images. So the above superiorities of this algorithm make it suitable for digital image of the network transmission process, and other fields which have higher safety requirements for digital images.%针对数字图像传输的安全问题,提出一种基于单一像素值改变的图像置乱新算法,该算法将密码学中维吉尼亚加密算法进行修正,使之能够应用于数字图像的加密.实验结果表明,该算法加密的图像安全性高,与传统的基于单一像素值改变的置乱算法相比较,具有更好的抗噪声性能,该算法具有很高的灵活性,其加密图像的置乱程度与工作密钥的选择具有密切的关系,并且适合加密任意尺寸的数字图像.以上优越性使得该算法更能适合于数字图像的网络传输过程,以及其他对数字图像安全有较高要求的领域.