Research on Image Scrambling Method Based on Combination of Arnold Transform and Exclusive-or Operation

Abstract

Aiming at the encryption problem in digital image information hiding process, an image scrambling algorithm based on combination of Arnold transform and exclusive-or operation is proposed. The algorithm first uses the Arnold transform to change the pixel position of the original image to obtain the initial scrambled image A, and then performs a bitwise exclusive-or operation on each pixel in the image A with its prior pixel. Finally, the gray value of the image is changed again by the high and low bit transposition operation to improve the image scrambling effect, and the final scrambled image S is obtained. The experimental results show that compared with Arnold's existing scrambling methods, the scrambled image is not only more difficult to recognize subjectively, but also has a significant change in its histogram, which is more suitable for the encryption of digital images and subsequent experiments.