Chaotic Digital Image Encryption Based on Fourier Transform.

In order to improve the security of chaotic digital image, the chaotic digital image encryption method is designed by the fusion optimization of Fourier transform technology. The initial input chaotic digital image is segmented, and Fourier transform technology is used to realize chaotic scrambling of the digital image and replace the pixel value of the image. By determining the parameters such as watermark embedding position and embedding strength, the watermark is embedded in the chaotic digital image, and the encryption of the chaotic digital image is completed by combining the generation result of the image key. Compared with the traditional encryption methods, it is found that the peak signal-to-noise ratio of the encrypted image obtained by the optimized design method is increased by about 5.0, and the average correlation coefficient of adjacent pixels is reduced by about 0.15. At the same time, the anti-attack ability of the encrypted image is significantly improved.