Algorithm 1. The confusion process of the proposed image encryption scheme.

Input: The plaintext image $P$ and three initial values $\left\{x\left(0\right), y\left(0\right), z\left(0\right)\right\}.$

Output: The confusion image $F.$

Truncate the plaintext image as size $L^2\times L^2,$ where $L^2$ is calculated using Equation (8).

2.Generate three chaotic sequences, X, Y, and z, where these lengths are $L^2\times L^2.$

3.Reshape the sequences X, Y, and z in columns into $L^2\times L^2.$ matrices, denoted as XL, YL, and ZL.

4.Matrices $S1=X_L\times Y_L$$\mathrm{and} S2=X_L\times Z_L$ can be obtained.

5.Sort $S_1$ and $S_2$ in ascending order, and obtain their index vectors $I_1$ and $I_2$.

6.The pixel locations of the plaintext image P are rearranged using the index matrix Ii, where i = {1,2}.

7.The confusion image F is obtained.