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This paper proposes a color image encryption algorithm based on a cloud model Fibonacci chaotic system, as well as a matrix convolution operation that can protect image content effectively and safely. The algorithm combines the cloud model with the generalized Fibonacci, creating a new complex chaotic system that realizes the dynamic random variation of chaotic sequences. The chaotic sequence is used to scramble the pixel coordinates of the mosaic images of the R, G, and B components of the color image. Then, the chaotic sequence value is used as a matrix convolution cloud algorithm that alternately updates the input value of the matrix convolution operation and the pixel value to obtain the permutation transformation of the original pixel value. Finally, the pixel values of the replacement and cloud model Fibonacci chaotic sequence and the pixel values of the front (rear) adjacent pixel points are subjected to a two-way exclusive XOR operation. Realizing the change of the arbitrary pixel value causes a chain transformation of the pixel values of all of the pixel points, and sequentially generates an encrypted image. Experiments show that the histogram of the encrypted image is smoother and adjacent pixels of the image have low correlation. In addition, this algorithm can resist attack experiments such as differential attack, select plaintext attack and noise attack and provides high encryption security, high anti-interference, and strong robustness. The dynamic chaotic system is used to realize the color image encryption of the dynamic key, and the encryption algorithm has higher security and the validity of the algorithm.

In order to solve the problems of strong correlation and high redundancy in the process of color image encryption, a color image encryption algorithm based on cloud model Fibonacci chaotic system and matrix convolution operation is proposed. Firstly，the algorithm permutates the pixel coordinates of the image stitched by the R，G，and B components of the color image. Secondly, the chaotic sequence values are used as the input values of the convolution kernel. Alternative matrix convolution operation is performed on the chaotic sequence values and the pixel values to achieve the pixel transformation. Thirdly, two opposite XOR operations with the cloud model Fibonacci chaotic sequence and the previous adjacent pixel values are done to generate the encrypted image. Finally，simulation experiments show that the histogram of the encrypted image is smoother, the pixel distribution is uniform, the correlation between adjacent image pixels is low, and the average horizontal, vertical and diagonal correlation coefficients of the RGB components of the encrypted image are --0. 0010, 0. 0016 and 0. 0031，respectively. The encrypted image can resist the attack experiments such as differential attack，plaintext attack, noise attack and shear attack. The proposed new encryption algorithm has the characteristics of high encryption security，high anti-interference and strong robustness. [ABSTRACT FROM AUTHOR]