Research on Chaos Image Encryption Algorithm Based on Scrambling Diffusion

In image encryption, there are problems such as strong correlation between adjacent pixel positions and low noise resistance. An encryption algorithm based on RSA and Lorenz hyperchaotic systems for scrambling and diffusion is proposed. Firstly, the scrambling part is accumulated, and the range of height (a-b) and width (c-d) of image blocks is randomly set. The first block randomly extracts height and width from the range to determine the value of the extracted height. The second block extracts the same height but different widths, and so on, Obtain the scrambled image. Secondly, the pseudo-random sequences generated by the Lorenz hyperchaotic system are processed to obtain an array, which is then divided into two subsets. Then, the one-dimensional vector formed by scrambling the image is iteratively XOR with two subsets. The experimental results show that the algorithm proposed in this paper reduces the correlation between adjacent pixels in the image and improves the noise resistance performance.